Stunt Car Racer - update of that would be fun, but its kind has been done with Track Mania
So many people say that, and honestly, I couldn't disagree more. The two games have nothing in common besides driving on roller-coaster like tracks.
TrackMania is a simple human vs. track game. And the tracks just aren't interesting enough to make that fly. Sure, you can race your ghost or your friend's ghost, but really, at its heart, it's just a time trial game over increasingly annoying terrain. If I'm going to play a time trial game, give me Richard Burns Rally. At least those cars are fun to drive, and the stages are challenging without being annoying.
Stunt Track Racer (or Stunt Car Racer in some regions) was human vs. human taking place on the track. There's bumping, damage, passing and blocking. At it's heart was a great arcade racer. The closest thing I can think of in spirit is the multi-player race mode in Flatout (the first one, not 2, not Ultimate Carnage or any of the other ones, but the original). Sure, it's a completely different game in looks, but it has the same human vs. human(s) driving element, taking part in a challenging landscape.
Anyhow, I digress. I'm one of the geeks that would like to see a modern Stunt Track (or Car) Racer.