Currently I'm playing the Korean version of this Massive Multiplayer Online Racing Game, and it's extremely fun. The US version should be coming out pretty soon, if anyone wants to play with me, here is the website.
I've convinced Guerriero of these forums to play with me, already, so I think that other people should look in to it also.
I'm in the racing team called "PROTL", which is one of the more well known racing teams for the North American Kart Rider, and we are pretty respected among the NAKR community. Here are 2 videos that demonstrate the gameplay, these are made by one of the members of my racing team, Ryan. He is the one doing the racing in these, by the way.
and here is a video of a random korean person racing on one of my favorite racing tracks, I just wanted to share it because it's a REALLY cool track.
That racer's name is lMAHAlMINA, I believe, and she is in one of the most respected korean racing teams, MAHA, so props to her.
Post here if you are interested, and I'll let you all know when it opens officially in North America. If you live in Europe, unfortunately you can't play the North American version, since Europe is getting their own kart rider version. If you want to play with me really badly and you live in Europe, then you have to set up an American VPN, basically a proxy to mask your ip address so that the game thinks you are American.