By now, nearly every person in this country has heard or read about a second oil rig accident which has happened near Morgan City, Louisiana. Although it appears that only a small amount of environmental damage was done, how will the reaction to this news play out in the markets through the coming week?

I'm very thankful that this most recent oil rig accident happened late on a Friday. I certainly believe that if this accident had happened a few hours earlier in the day, I probably wouldn't have liked to witness the way the markets reacted. Now, we have two days to absorb the news of what has happened before full-scale trading resumes. Really, I'm very happy about that.

MOST NOTEWORTHY: Some of today's more noteworthy downgrades included Dean Foods Co (DF), Louisiana-Pacific Corp (LPX), Costco Wholesale Corp (COST), Alcan Inc (AL) and Horizon Offshore, Inc (HOFF):

• Dean Foods Co (NYSE: DF) was cut to Neutral from Overweight at JP Morgan to reflect future guidance concerns after management's cautious tone.

• Louisana-Pacific Corp (NYSE: LPX) was downgraded to Strong Sell from Buy at Matrix USA. The firm believes a weak housing market is having a significant negative impact on shares and sees downside to $14/share.

• Costco Wholesale Corp (NASDAQ: COST) was taken off the Strategic Stock List at UBS based on valuation.

• Bear Stearns cut Alcan (NYSE: AL) to Peer Perform from Outperform based on valuation.

• Oppenheimer downgraded Horizon Offshore (NASDAQ: HOFF) to Neutral from Buy on news of the acquisition by Cal Dive International (NYSE: DVR) as the firm believes the likelihood of a materially higher bid is low...

OTHER DOWNGRADES:

• Goldman cut Federal Signal Corp (NYSE: FSS) to Sell from Neutral.

• AG Edwards downgraded EPIQ Systems, Inc (NASDAQ: EPIQ) to Hold from Buy.

• Raymond James downgraded United Community Banks, Inc (NASDAQ: UCBI) to Neutral from Buy.

• Wachovia cut Targa Resources Partners LP (NASDAQ: NGLS) to Market Perform from Outperform.

• Gerdau Ameristeel Corp (NYSE: GNA) was downgraded to Sell from Neutral at Goldman.

• Nucor Corp (NYSE: NUE) was taken off Goldman's Conviction Buy List.

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