As you already know, Robert Pattinson, Kristen Stewart, and Taylor Lautner will be on Jimmy Kimmel on June 23rd, but it looks like a few more cast members (and bands from the Eclipse soundtrack) will be appearing on TV soon. The Twilight Lexicon has the list:

May 26- The Black Keys (number 7 position on the Eclipse soundtrack with Chop and Change) will be on Jimmy Fallon

May 18-Nikki Reed is on Ellen.

May 19-Robert Pattinson is on Ellen. Also on the same day is self-professed Twilight fan Adam Lambert. This should be interesting!

June 6-Vampire Weekend(number 10 on the Eclipse soundtrack with Jonathan Low) will be on Stephen Colbert. No word if he’ll be bringing his stapler with him.