Link was screwed up:http://lolsoft.com/mrlollige/?p=27
You should try out Allegro Sprite Editor and add it. It's got layers, animation and it's just simple to use. The only drawbacks are the way the pallet behaves sometimes (changing the top color will destroy your pallet... i think it's a 'feature' but it's lame as hell), and the frames and layers are only accessable by tabing to them, but that's just a mild annoyance most of the time.
I've got about a half-dozen others as well that are in various states of useability. Grafx 2 is another of those apps that is heavilly based on another app's design (is it a port?). I like MTpaint, but it's got some weird design as well. The number keys are zoom levels, but 1-4 are 10%-100% and the next level with 5 is 400% and then 6 is 800%... what happened to 200 and 600... and why would you want to zoom to 10% or 25% when editing pixelart anyway? 1-4 are pretty much wasted levels, and the others aren't really useful. 100% and 400% are the only really useful zoom levels... the rest you have to use the menu or manually zoom to it. It does have some neat effects, and if you want to achieve a pixeled sort of look, but aren't really familiar with pixel art you can make some pretty neat pseudo-pixel-art with it rather quickly. The vertical pallet is odd as well, and i dunno if it's common or if my computer just sucks, but it's got glitches with some of the tools.
Pro-Motion is weird... it LOOKS like photoshop or the gimp, but aside from that, it's completely alien in the way it behaves. Actually, it sorta intimidated me. You go to make a new image and it pops up this form with tabs and a million settings. I still don't know if I understand half of it, so I don't know if I'm screwing things up or not.
Anyway, I'm probably taking this way off topic and sounding like a whiny biatch, so I'll shut up. It might be interesting to explore future GUI / interactivity of pixeling apps, or just apps in general.
Just curious, how many people use a tablet to do their pixeling? I've tried it a few times, but it just doesn't feel right to me. And I wonder what it would look like to use vector art to create pixel art... aliased vector art that could be rotated, scaled, etc... maybe textured...