The 2D sprites from Street Fighter III: Third Strike are gorgeously done. There are even some genga laying around of some of the individual animations.

How would sprites be uploaded here, though, without uploading 50+ entries at a time? A super consolidated upload featuring all the sprite animations of a character?

One distantly related idea that I don't think would have a place on this site (but that I think would be cool regardless) is to create an interactive .swf that allows you to see every individual sprite animation of a character, categorized and separated, on a single page. You could play them back normally or frame by frame them with a small set of buttons below each individual animation.