Chalk up another confirmation from the ESRB: Sonic Adventure and Sonic Adventure DX Director's Cut has been rated for ports set to show up on PC, PlayStation 3, and Xbox 360.
Sonic Adventure was the blue blur's first true foray into a 3D platformer that branched out into various paths with different gameplay styles by way of Sonic's friends. Sonic Adventure DX was later released on the Gamecube that added a variety of changes such as a revamp of the Chao System and the ability to play 12 Game Gear games.
While the ports are welcome and all, it bears asking as to why both titles are getting a port if DX is on the way already. There really isn't anything going for the original version so we'll just have to see what Sega is up to.