MOST NOTEWORTHY: Siemens , Siliconware Precision and Palm were today's noteworthy upgrades:

• Goldman upgraded Siemens AG (NYSE: SI) to Buy from Neutral and views shares as defensive in the current environment.
  
• Merriman upgraded shares of Siliconware Precision (NASDAQ: SPIL) to Buy from Neutral on valuation, as they believe the negative sentiment regarding the U.S. economy is already priced into shares.
• JP Morgan upgraded Palm (NASDAQ: PALM) to Overweight from Underweight citing new smart-phone products expected in 2008 and stronger-than-expected Centro sales.

OTHER UPGRADES:

• Pep Boys (NYSE: PBY) was raised to Neutral from Underperform at Credit Suisse.
• Jefferies upgraded Pioneer Drilling (NYSE: PDC) to Buy from Hold.
• Deutsche Bank upgraded Cablevision (NYSE: CVC) to Buy from Hold.

Gasoline inventories dropped below their five-year average and are now 6% below last year's average, according to Joseph Dancy, an adjunct professor at Southern Methodist University, in an essay published in Barron's this weekend.

This means the outlook for investing in energy remains good, Dancy believes, as demand for gasoline will grow 2% with little supply relief in sight. Particularly the lack of new refinery capacity means positive growth prospects for a company like Matrix Service Company (NASDAQ: MTRX) that specializes in repair and maintenance services to the refining, distribution and pipelines sectors.

Dancy wrote the supply and demand balance for energy could mean a sharp escalation of energy prices. Mexico's Cantarell field's output, the second largest in the world as measured by output, declined 17% in March from year-earlier levels, while offset by new production increases at a nearby field, total crude production from Mexico is down 5%. In addition, Venezuela production should get hit at some point as Chavez has taken control of exploring for and producing energy away from the foreign experts. And Nigeria, who sends 1 million barrels per day to the US, is also in a politically tenuous situation.

Add to this, the huge swing producer, Saudi Arabia, announced that is will no longer increase production after 2009, which might indicate the nature of its oil reserves.

In addition to Matrix, Arena Resources Inc (NYSE: ARD), OMNI Energy Services Corporation (NASDAQ: OMNI), Pioneer Drilling Company (AMEX: PDC), Natural Gas Services Group Inc (AMEX: NGS) were mentioned as attractive investment ideas.

MOST NOTEWORTHY: Four specialty retailers initiated at FTN Midwest were today's most noteworthy moves in the market:

• FTN Midwest initiated shares of Ethan Allen Interiors Inc (NYSE: ETH), Pier 1 Imports (NYSE: PIR) and Bed Bath & Beyond Inc (NASDAQ: BBBY) with Neutral ratings and Williams-Sonoma Inc (NYSE: WSM) with a Buy rating.

OTHER INITIATIONS:

• BMO Capital started Bronco Drilling Co (NASDAQ: BRNC), Pioneer Drilling Co (AMEX: PDC) and Union Drilling, IncNASDAQ: UDRL) with Outperform ratings.

• CIBC started Chemtura Corp (NYSE: CEM) with a Sector Underperformer rating and $11 target on valuation.

• C.E. Unterberg started Altus Pharmaceuticals Inc (NASDAQ: ALTU) with a Buy rating and $12 target, believing the company's efforts to develop the first juvenile formulation of a pancreatic enzyme will be a key growth driver.

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