Anyone had a play with Duratrax RealRace? Looks like it might be useful to learn some basic set-up tips and driving skills without wearing out any tires. Obviously it's never going to replace the real thing, but it could have potential.
http://www.realrace.com/
I've been playing with Virtual RC racing demo. which is good fun (albeit limited as there are only 2 tracks and you can only practice not race), however it's only got flat stuff and only nitro ones at that.
http://www.virtualrc.com/