I have got some sleepless nights with Minikarting (http://www.minikarting.com). Pretty addictive I think ;)

What else would you recommend?

tht game has to be the rubbishest ever.....u can loop from the start line round across the grass and across and get a secong lap...

The game you posted was rather simple, it's OK if you're bored and are looking for something to pass the time with. But for a better free racing game experience I'd say give Trackmania a try.

Well the features that makes a good flash game for me are for example simple, addictive, fast to play and possibility to compete with friends. Maybe that's why I liked minikarting.

Do I have to download something for playing trackmania? I'm playing with mac so does it work?

The very first one in the link I posted is the free version of the game (500MB download) but it's only for Windows. So it looks like you won't be able to play it..

I'll see if I can find a similar game for the Mac.