After barriosquare there is a new FourSquare App for N900 coming soon for your maemo and symbian phones: SquareIt.

This app was a prototype  of a FourSquare-client for Nokia Qt-platforms during a coding competition in 02/2010 Mobile DevCamp in Helsinki created by Juha. The prototype was  showing how easy it is to create UIs with Qt Quick and integrate it to native Qt code. 

Now the app is under heavy development and coming in April 2010 :-)