Recently finished San Andreas on the xbox. I remember playing it on the ps2 and having a blast and xbox converion is even better. It has better controls with the aircrafts, cars, on foot, custom music-playlist, gnarly graphics (not as greatly improved as expected though), I don't think any story related changes were made. Over all a solid conversion of a GTA classic and a favorite of mine.

Now that the main story is finished I'm contemplating going for a 100% run. That's probably going to add another good 900 hours of gameplay.