MOST NOTEWORTHY: Ascent Solar, Xcorporeal and Chipotle Mexican Grill were today's noteworthy initiations.

• Cowen said Ascent Solar Technologies Inc.'s (NASDAQ: ASTI) unique thin-film solar technology is well suited for integrated applications. Shares were started with an Outperform rating.
• Roth Capital believes Xcorporeal Inc (AMEX: XCR) is targeting a large, unmet market, as the firm notes that 500K patients are expected to receive kidney therapy over the next few years. Roth, which initiated shares without a rating, anticipates that the company will obtain regulatory approval for the home therapy and critical care markets during the next few quarters, possibly creating a catalyst for the stock to appreciate.
• JP Morgan initiated the Class B shares of Chipotle Mexican Grill Inc (NYSE: CMG.B) with an Overweight rating as they believe the recent pullback provides a compelling entry point.

OTHER INITIATIONS:

• Lehman initiated NCR Corporation (NYSE: NCR) with an Overweight rating and $30 target.
• Sandler initiated Delphi Financial Group Inc (NYSE: DFG) with a Buy rating and $34 target.

MOST NOTEWORTHY: O'Reilly Automotive, Corning and Lincoln National were today's noteworthy downgrades:

• William Blair downgraded O'Reilly Automotive (NASDAQ: ORLY) to Market Perform from Outperform following weak Q1 results, citing the potential for further downward EPS revisions.
  
• Thomas Weisel downgraded Corning Inc. (NYSE: GLW) to Market Weight from Overweight citing balanced risk/reward given the backdrop of a maturing LCD penetration and generational upgrade cycle, and the challenging environment.
  
• Wachovia downgraded Lincoln National Corp. (NYSE: LNC) to Market Perform from Outperform as they believe the weak Q1 market weakness will impact profitability.

OTHER DOWNGRADES:

• Smith International (NYSE: SII) was cut to Perform from Outperform at Oppenheimer.
  
• Delphi Financial (NYSE: DFG) was downgraded at Friedman Billings to Market Perform from Outperform.
  
• CIBC downgraded Biovail (NYSE: BVF) to Sector Performer from Sector Outperformer.