Some of you may have seen this last night, Hull has created a new feature in the site: DSiPaint Spriter. Like the DSiPaint paintings and Filpnote Hatena, you can make animated pictures.
It's a double canvas and has the usual tools for DSiPaint. If you see in the middle of the screen, you'd see an 8, 4, W. 8 is 8 frames, 4 is 4 frames, W is a wider frame with 4 frames.
Here's the link: http://dsipaint.com/menu_dsipaint_spriter.php