CAL4M1TY on 19 April 2009
I think it should be noted that of the 96 tracks, that'll include the reverse route, as well as the full track and broken up parts (for shorter races) as well. Even with this is mind, there's likely to be at least 20 unique tracks (if not a lot more), which is impressive anyway.
Customisable user created tracks seems a bit too out there to be real though.
