Listed under Events at the official site:
12/11/2008 - Tonight Show w/Jay Leno. (Tickets)
12/16/2008 - Jimmy Kimmel Live. (Tickets - not listed yet)
12/18/2008 - Last Call with Carson Daly. (Tickets - sold out)
(Thanks Mad Bob)
Note: It looks like the Carson Daly appearance will be taped on the 12th, and aired on the 18th. The Leno appearance should be recorded on the 11th, for airing later that night. Not sure about Kimmel.
Update: Geffen has posted the dates on the front page, too.