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The client will work on any BlackBerry device with a trackball -- essentially 8000 and 9000 series handsets, plus the Storm -- although a special client built for its touchscreen is separately in the works as well.
It's still officially considered a beta version, so be prepared for perhaps a few rough edges here and there. But as we saw in the private beta, the app is generally stable and provides the typical expected functionality Foursquare users on iPhone and Android have come to know and love. Still, Foursquare says new features for the BlackBerry client are still in the works, so if you're a BB user keep an eye on snagging the latest builds as they come out.