Sonic Tutorial: For Starters
Zoom the Hedgehog on May 29, 2010
The Mystical Forest Zone
The Mystical Forest Zone isn't the only place to find Sonic sprites.
The Spriter's Resource is a good website to. I just forgot to mention it. It's a bit more organized... but has less custom character spriters.
This is kind of an experimental page. The first part of my tutorial on how to make a Sonic sprite comic. This is just want you should first do to get started making a Sonic sprite comic.