From LilithLOTR - all on Tuesday:
David Letterman: Kid Scientists, Keanu Reeves, Michael Buble
Conan O'Brien: Alan Cumming, Gavin Rossdale, They Might Be Giants
Last Call: Green Day
Daily Show: Eric Idle
The View: Seth Green, John Tesh, Connie Selleca
And in the future:
About Wil Wheaton: He's got a guest-starring part in CSI! He hasn't said too much about it yet, but it sounds way cool. I believe that's the original CSI, but I'm a couple days behind reading.