• Sprint Nextel Corp. (NYSE: S) to report Q1 earnings; conference call at 8:00am.
• W.W. Grainger, Inc. (NYSE: GWW) to hold sales conference call at 8:00am.
• XM Satellite Radio Holdings, Inc. (NASDAQ: XMSR) and Sirius Satellite Radio, Inc. (NASDAQ: SIRI) to report quarterly earnings; the conference call is at 10:00am for XM and at 4:30pm for Sirius.

• Wal-Mart Stores, Inc. (NYSE: WMT) to report Q1 earnings; conference call at 7:30am.
• Toll Brothers, Inc. (NYSE: TOL) to report preliminary Q2 results and outlook at 2pm.
• Applied Materials, Inc. (NASDAQ: AMAT) to report Q2 earnings; conference call at 4:30pm.

• FCC Open Commission Meeting at 9:30am.
• SEC Open Commission Meeting at 10:00am.
• Macy's, Inc. (NYSE: M) to report Q1 earnings; conference call at 10:30am.
• Agilent Technologies, Inc. (NYSE: A) to report Q2 earnings; conference call at 4:30pm.

Salix (NASDAQ: SLXP) has announced it will launch a generic version of its Colazal (treatment for ulcerative colitis) with Watson Pharma (NYSE: WPI). Mylan (NYSE: MYL), Apotex, and Roxane have received FDA clearance to market their own generic versions of SLXP's Colazal.

SLXP is recently down $1.01 to $8.00 in pre-open trading. Wachovia says, "Valuation range: $9 to $10."

SLXP January option implied volatility of 104 is above its 26-week average of 72 according to Track Data, suggesting larger risk.

Options Update is provided by Stock Specialist Paul Foster of theflyonthewall.com