Analyst Upgrades

• Polo Ralph Lauren (RL) to neutral from underperform at BofA/Merrill.
• Sigma-Aldrich (SIAL) to outperform from market perform at Leerink.
• Petrobras (PBR) to overweight from equal weight at Barclays.
• Silvercorp Metals (SVM) to buy from neutral at UBS.
• PROS (PRO) to buy from hold at Jefferies.
• Power Integrations (POWI) and Monolithic Power (MPWR) to buy from neutral at Roth Capital.
• Diodes (DIOD) to outperform from neutral at RW Baird.
• Whole Foods (WFMI) to hold from sell at Hapoalim.
• Sinclair Broadcast (SBGI) to overweight from neutral at JPMorgan.
• Sappi (SPP) to outperform from neutral at Macquarie.
• Alpha Natural (ANR) to buy from hold at BB&T.
• Watts Water (WTS) to buy from hold at Brean Murray.

Analyst Upgrades

• Micron (MU) to buy from neutral at UBS.
• Baker Hughes (BHI) to outperform from market perform at BMO Capital.
• PDL BioPharma (PDLI) to outperform from sector perform at RBC Capital.
• Fluor (FLR) and Rush Enterprises (RUSHA) to buy from neutral at BofA/Merrill.
• Camden Property (CPT) to outperform from neutral at Macquarie.
• Pinnacle Financial (PNFP) to buy from hold at Wunderlich.
• Linear Technology (LLTC) to neutral from reduce at Nomura.
• Hologic (HOLX) and Illumina (ILMN) to buy from hold at Citigroup.
• F5 Networks (FFIV) to buy from neutral at Gleacher.

Analyst Upgrades

• Dynegy (DYN) was upgraded to buy from neutral at Pritchard.
• Itron (ITRI) was upgraded to neutral from underperform at Macquarie.
• Goldman upgraded Ameren (AEE) to sell from conviction sell.
• Signet Jewelers (SIG) was upgraded to buy from hold at Societe Generale.
• JPMorgan upgraded Synopsys (SNPS) to overweight from neutral.

"As soon as it is possible to do so, several North American companies are likely to move quickly to enter Cuba, the greatest untapped opportunity remaining in the western hemisphere," says Jim Powell.

Here, the editor of Global Changes & Opportunities looks at what he believes are the best investment opportunities for investing in Cuba, should such a change occur.

"In August, Raul Castro announced that 500,000 public workers in Cuba will be laid off and will need to find jobs in newly-legalized small private enterprises.

MOST NOTEWORTHY: Google, Ross Stores and Novartis were today's noteworthy upgrades:

• Jefferies upgraded Google (NASDAQ: GOOG) to Buy from Hold to reflect the company's "impressive" improvements in monetization in Q1, no signs of weakness from the economic downturn and upside potential from display, video and mobile.
  
• Lehman upgraded Ross Stores (NASDAQ: ROST) to Overweight from Equal Weight and believes the company's 2008 guidance of 8-9% sales growth and up to 20% bps in margin expansion will prove conservative.
  
• Morgan Stanley upped Novartis (NYSE: NVS) to Overweight from Underweight on valuation and expectations for positive news flow from the company's vaccine division.

OTHER UPGRADES:

• JP Morgan upgraded Bladex to Neutral from Underweight.
• William Blair raised Watsco (NYSE: WSO) to Outperform from Market Perform.
  
• SunTrust (NYSE: STI) was upgraded at Baird to Neutral from Underperform.

MOST NOTEWORTHY: Patterson Companies, Virgin Media and MannKind were today's noteworthy downgrades:

• Patterson (NASDAQ:PDCO) was downgraded to Neutral from Outperform at Baird, as the firm's checks indicate industry fundamentals have softened and it sees greater near-term risk for dental consumables than dental equipment.
  
• Virgin Media (NASDAQ:VMED) was cut to Hold from Buy at Jefferies as they believe the company's results could be under pressure given the continued competitive activity and potential weakening of the UK economy.
  
• Piper downgraded shares of MannKind (NASDAQ:MNKD) to Neutral from Buy and lowered their target to $1.50 after Pfizer (NYSE:PFE) discontinued inhaled insulin Exubera due to an increase in lung cancer cases.

OTHER DOWNGRADES:

• Lehman cut Cheniere Energy (LNG) to Equal Weight from Overweight.
  
• Pantry (PTRY) was cut to Market Perform from Outperform at Friedman Billings.
  
• JP Morgan lowered Watsco (WSO) to Neutral from Overweight.

MOST NOTEWORTHY: Ruth's Chris Steak House (RUTH), Hilton Hotels (HLT) and Champps Entertainment (CMPP) were today's noteworthy downgrades:

• Goldman cut shares of Ruth's Chris Steak House (NASDAQ: RUTH) to Sell from Neutral following the company's preliminary Q2 sales, as they expect relative underperformance over the near-term. Goldman believes macro headwinds could weigh on Ruth's client base and keep traffic negative for the rest of the year.

• Hilton Hotels (NYSE: HLT) was downgraded by a number of firms after the Blackstone Group (BX) takeout offer: Jefferies and Citigroup cut shares to Hold from Buy, Calyon downgraded shares to Neutral from Buy, Raymond James downgraded shares to Market Perform from Strong Buy, Suquehanna cut shares to Neutral from Positive and Bear Stearns downgraded Hilton Hotels to Peer Perform from Outperform.

• B. Riley downgraded shares of Champps Entertainment (NASDAQ: CMPP) to Neutral from Buy to reflect the buyout offer from F&H Acquisition Corp...

OTHER DOWNGRADES:

• B. Riley downgraded shares of ACR Group (AMEX: BRR) to reflect the company's merger agreement with Watsco Inc (WSO).

• Jefferies cut Dobson Communications Corp (NASDAQ: DCEL) to Hold from Buy.

• Piper Jaffrey downgraded Selective Insurance (NASDAQ: SIGI) to Market Perform from Outperform.

• Kaufman downgraded Parametric Technology (NASDAQ: PMTC) to Hold from Buy.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).

MOST NOTEWORTHY: Continental Airlines, Inc (CAL), Molson Coors Brewing Co (TAP), Watsco, Inc (WSO), K-V Pharmaceutical Co (KV.A), Progressive Corp (PGR) and Color Kinetics (CLRK) were today's noteworthy downgrades:

• Goldman downgraded shares of Continental Airlines, Inc (NYSE: CAL) to Neutral from Buy on valuation, higher oil prices and a weak domestic market.

• Goldman also downgraded Molson Coors Brewing Co (NYSE: TAP) to Neutral from Buy based on the increase in analyst estimates, valuation and the potential for margin pressure in the summer.

• BB&T cut Watsco, Inc (NYSE: WSO) to Hold from Buy based on valuation and catalysts that are already reflected in the share price.

• Roth Capital downgraded shares of K-V Pharmaceutical Co (NYSE: KV.A) to Hold from Buy, telling clients they have learned that Par Pharmaceuticals Cos (PRX) has launched generics of 50, 100 and 200mg Toprol-XL. The firm expects a material impact to KV's 100 and 200mg strength generics.

• Stifel expects investor enthusiasm regarding Progressive's Corp (NYSE: PGR) recapitalization plan to fade as underwriting fundamentals deteriorate and cut shares to Sell from Hold.

• Color Kinetics (NASDAQ: CLRK) was downgraded to Hold from Sell at Needham on valuation...

OTHER DOWNGRADES:

• Citigroup cut The Phoenix Co's (NYSE: PNX) to Hold from Buy.

• KeyBank downgraded Lubrizol Corp (NYSE: LZ) to Hold from Buy.

• Goldcorp Inc (NYSE: GG) and Freeport-McMoRan Copper & Gold Inc (NYSE: FCX) were downgraded to Market Perform from Outperform at BMO Capital.

• Susquehanna downgraded Build-A-Bear Workshop, Inc (NYSE: BBW) to Neutral from Positive.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).

MOST NOTEWORTHY: Burger King Holdings, Inc (BKC), Supertel Hospitality Inc (SPPR), OSI Pharmaceuticals, Inc (OSIP), Brown-Forman Corp (BF.B) and NGAS Resources, Inc (NGAS) were today's noteworthy initiations:

• CIBC considers shares of Burger King Holdings (NYSE: BKC) to still be attractive and has above-consensus estimates, starting shares with an Sector Outperformer rating. The firm believes increased operating hours and breakfast value meals will drive results, while cost savings should help margins.

• JMP Securities believes there is plenty of room for growth at Supertel Hospitality (NASDAQ: SPPR) via acquisitions, leading to strong FFO upside, initiating shares with an Outperform rating and $8 target.

• ThinkEquity sees additional upside for Tarceva and started OSI Pharmaceuticals (NASDAQ: OSIP) with a Buy rating and $50 target.

• AG Edwards believes Brown-Forman (NYSE: BF.B) is well-positioned to benefit from new trends in spirits and wine, starting shares with a Buy rating and $74 target.

• RBC Capital is positive on NGAS Resources' (NASDAQ: NGAS) growth potential and high quality assets, starting shares with an Outperform rating and $11 target...

OTHER INITIATIONS:

• CIT Group (NYSE: CIT) was started with a Market Perform rating at Keefe Bruyette.

• Oppenheimer started shares of Watsco, Inc (NYSE: WSO) with a Buy rating.

• ThinkEquity started Coley Pharmaceutical Group, Inc (NASDAQ: COLY) with an Accumulate rating and $10 target.

• Goldman initiated shares of Northwest Airlines Corp (OTC: NWACQ) with a Neutral rating and $26 target.

• Duetsche Bank initiated PPL Corp (NYSE: PPL) with a Buy rating and $51 target.

• Citigroup initiated Comverge, Inc (NASDAQ: COMV) with a Hold rating and $26 target.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).