I'm sure this has been done, but I thought I'd do an updated version.
 
Everyone knows the old schoolers:  
Harrison Ford
Bob Barker
Al Michaels
James Dean (yes, I realize he never was initiated)
 
But here are some that I only recently learned were Snakes:
 
Paul Rudd (Nu / Kansas) - Best known from Anchorman, The 40 Year Old Virgin, and Clueless. 
Brian Fantana: No, she gets a special cologne... It's called Sex Panther by Odeon. It's illegal in nine countries... Yep, it's made with bits of real panther, so you know it's good.
 
Josh Saviano (Beta Alpha / Yale) - Paul Pfeiffer from Wonder years!
 
William Daniels (Gamma Beta / Northwestern) - They main teacher guy from Boy Meets World (also the voice of Kitt in Night Rider).
 
Joe Buck (Beta Eta / Indiana) - Fox Sports. Google him, you'll recognize him.
 
Eli Manning (Epsilon Xi / Ol' Miss) - Giants...
 
Chip Arndt - Amazing Race 4 Winner. Best known as being the ex-husband of Reichen Lehmkuhl (who is the dude that Lance Bass came outta the closet with).  
