MOST NOTEWORTHY: Micron, China Sunergy and Medtronic were today's noteworthy upgrades:

• Deutsche Bank upgraded shares of Micron (NYSE: MU) to Buy from Hold as they believe improved pricing and the company's cost reductions should drive a strong margin recovery. The firm raised MU's target to $11 from $7.
  
• Jefferies raised China Sunergy (NASDAQ: CSUN) to Hold from Underperform following the company's Q1 beat to reflect its improved outlook for the production of higher efficiency cells and better controls over cash flow measures.
  
• Goldman raised Medtronic (NYSE: MDT) to Buy from Neutral based on potential earnings upside from strong market share and broad distribution.

OTHER UPGRADES:

• UBS upgraded National Fuel Gas (NYSE: NFG) to Buy from Neutral.
  
• Arris (NASDAQ: ARRS) was raised to Outperform from Market Perform at Friedman Billings.
  
• Piper upgraded Central Garden & Pet (NASDAQ: CENT) to Buy from Neutral.

Last December, over 100 stocks were featured in our Top Picks for 2007 report. Now, at mid-year, we turn to the 20 advisors whose picks showed the strongest gains to get an update on their previous picks, as well as a new favorite stock for the second half of the year.

Chris Mayer, editor of Capital & Crisis, chose Rosetta Resources (NASDAQ: ROSE) as his favorite stock for 2007, which rose 32% as of 6/1/07. Here is his original recommendation for Rosetta and his current opinion on the stock.

For his new top pick, National Fuel Gas Co. (NYSE: NFG), he says, "I love companies with 'hidden assets,' things that have been lying around gathering dust but suddenly turn into something very valuable. It's like finding an old Mickey Mantle baseball card in Dad's attic.

"One stock that is a hidden asset in the Appalachians is National Fuel Gas. Like an old baseball card, it's been around a long time. NFG incorporated in 1902, though its predecessor companies are much older. It is an integrated gas utility. This means it is involved in every aspect of natural gas, from the bottom of the well to the burner tip.

"NFG has its own exploration and development company, with oil and gas reserves across many states (45% of production is oil). It has a regulated utility serving 727,000 customers in New York and Pennsylvania.

"It owns nearly 3,000 miles of pipeline, along with 32 storage fields. NFG also owns over 100,000 acres of black cherry hardwood in Pennsylvania. Finally, NFG has a small energy broker business with some 25,000 customers.