As reported yesterday, Nelisquare was being developed and today the Pre Alpha Download is available for the Nokia N900.
Nelisquare is a Foursquare client for Maemo and upcoming MeeGo devices. There might also be a version for Symbian^3 phones.
The application will make its way into the repositories but for now its can be downloaded from Here
I'm not much of a FourSquare fan to be honest. I don't really get it. I've never liked stalkers, but I suppose thats just me.