Also, this remake just got off the ground, but it already looks really fricking sweet!
Here's its website. Keep in mind though that you can't join their forum unless you're gonna contribute to the project.
All I know right now, is that Sonic 3 HD is gonna be of the complete version of Sonic 3, Sonic 3 & Knuckles. If it ends up having online multiplayer like Sonic 2 HD, I'll very gladly do an Abandonia tournament for this remake as well!...