Pole Position on the Atari 2600.
Monaca Grand Prix (I think, it was definately something Grand Prix) on the Master Syster/Game Gear.
Can't remember any racing games on the NES, but everyone knows the great Super Mario Kart on the SNES.
Gran Turismo 1 and 2, Colin McRae World Rally, Vrally, Need For Speed: Hot Pursuit and probably a few others which I can't remember on the PS1.
Gran Turismo 3 and 4, Tourist Trophy, Riding Spirits 1 and 2 (oh dear), TT Superbikes, Colin McRae 2.0, and again a few more I can't remember on the PS2.
The first PC racing game I played was round a friends many years ago (we never had a PC 'til I was about 12/13) and that was NetworkQ Rally or something. The first racing game I had on my PC when I got one was Carmageddon and Midtown Madness. It wasn't 'til I was about 17/18 I discovered the likes of LFS and GPL, and then it's pretty much grew from there. I now have LFS, rFactor, GPL, GTL, GTR, GTR2.
And a few weeks ago I treated myself to a Xbox360 (I know i'm rather late jumping on the 'next gen' console bandwagon) just so I could play Forza2. After having played it round a mates a lot, I had to have it myself.
PS. Anyone fancy a race on Forza sometime, add me on XBL. Same username as on here.