Analyst upgrades:

• Citigroup upgraded Cooper Industries (NYSE: CBE) to Hold from Sell to reflect improving macro indicators and a belief negative earnings revisions are unlikely going forward. The firm raised its target price to $37 from $28.
  
• Royal Bank of Scotland upgraded Siemens (NYSE: SI) to Buy from Hold on expectations the company will benefit from an economic recovery.
  
• Banc of America/Merril upgraded State Street (NYSE: STT) to Buy from Neutral and raised their price target to $50 from $40 following stress test results that show the company does not need additional capital. The analyst said the news "clears one of the bars on capital concerns."
  
• Teradata (NYSE: TDC) was raised to Market Weight from Underweight at Thomas Weisel.
  
• Target (NYSE: TGT) was lifted to Overweight from Neutral at JP Morgan.
  
• Diageo (NYSE: DEO) was upgraded at UBS to Neutral from Sell.

Analyst upgrades:

• UBS upgraded Nokia (NYSE: NOK) to Buy from Neutral as it believes the company's product portfolio is recovering.
  
• Canaccord upgraded Google (NASDAQ: GOOG) to Buy from Hold and raised its target to $450 from $300. The analyst said industry checks indicate deteriorating search conditions have started to improve in late March and notes that the market is already pricing in a weak Q1.
  
• Wachovia upgraded CGI (NYSE: GIB) to Outperform from Market Perform. In addition to valuation, the firm cited the company's defensive profile, comfort with its fiscal 2009 estimates, and its expectation that the company will continue to have strong signings.
• Siliconware Precision (NASDAQ: SPIL) was raised to Overweight from Neutral at HSBC.
  
• Matrixx Initiatives (NASDAQ: MTXX) was lifted to Buy from Hold at Roth Capital.

I am the Global Editor at MoneyShow.com and each week I interview an investing expert. This week, I spoke with Christoph Scherbaum, editor of the German edition of Personal Finance, who says German investors are cautious, but optimistic about their market.

Q. Christoph, some experts predict the beginning of a prolonged slowdown that will push consumer price inflation in Germany to as low as 2% next June. What do you think?

A. Consumer prices are not really a problem. August inflation was less than 4% and is estimated at 3% until year-end. The delayed effects of rising commodity prices will have a steeper decline. In addition, second-round effects through higher wage developments are now more visible. Therefore, the European Central Bank-despite poor economic data-will wait for a reassessment of its inflation target for 2010 until the second half of 2009

Q. To what extent do you think the US's financial worries are extending to German financial institutions?

A. It's a difficult question, but we have no big problem with our banks. German Finance Minister Peer Steinbrueck recently stated: "Although this financial crisis undoubtedly is the biggest economic risk for the German economy, I think the potential impact on us-after inquiries and interviews with the Bundesbank president-to be limited". He also reaffirmed the intent of a balanced federal budget in 2011.

MOST NOTEWORTHY: Oil and gas services companies, mining companies and Moody's Corporation (NYSE: MCO) were today's noteworthy upgrades:

• Morgan Keegan upgraded Natural Gas Services Group Inc (AMEX: NGS), Basic Energy Services Inc (NYSE: BAS) and Complete Production Services Inc (NYSE: CPX) to Outperform from Market Perform and Patterson-UTI Energy Inc (NASDAQ: PTEN) to Market Perform from Underperform, as the firm has a bullish outlook for drilling activity in the back half of 2007 and into 2008.
• JP Morgan upgraded shares of both Compania de Minas Buenaventu (NYSE: BVN) and Goldcorp Inc (NYSE: GG) to Overweight from Neutral on valuation.
• Moody's was upgraded to Overweight from Equal Weight at Morgan Stanley, citing increased confidence in revenue outlook and growth drivers.

OTHER UPGRADES:

• Inverness Medical Innovations Inc (AMEX: IMA) was upgraded to Buy from Hold at Stifel Nicolaus.
• Credit Suisse upgraded shares of Johnson Controls Inc (NYSE: JCI) to Outperform from Neutral, citing growth outlook in the company's building efficiency business.
• Allianz SE (NYSE: AZ) was upgraded to Buy from Add at WestLB on valuation and the company's strong Q1 results.