I just came back from NYCC, and I had to share my haul. I've been on GI Joe kick, so all the sketches I got are Joe characters.
Alpine by Mike Norton. He told me he was a big fan of the Alpine/Bazooka dynamic. So I think next time I'll get a companion piece.
Tunnel Rat by Larry Hama. GI Joe was the first comic I ever read (naturally, I brought those issues for him to sign).
Shipwreck by Chris Giarusso. Can you think of a better Joe for him to draw? He mentioned that he always though of Shipwreck as the Hawkeye of GI Joe, which is kinda true.
Iron Fist vs Storm Shadow by JK Woodward. Memo to Marvel and IDW: Make this crossover happen!
Dusty by Dustin Weaver. I wish I had a scanner, because the photo does not do it justice. The details are just unreal. He even used just a bit of white out on the goggles, which gives them a glint when the light catches it.
I also picked up an original Gotham Central page
And I also picked up a bunch of great Graphic Novels, including The Sixth Gun, volume 2, Bunn and Hurtt's The Damned and four Vertigo Crime books.