I don’t use Foursquare myself but the service is growing by the day. They have been actively developing their BlackBerry client and BBCool spotted the most recent update to v1.8.4. This new version fixes small bugs including permissions and scrolling. If you use the app often it is worth the upgrade.
Download Foursquare for BlackBerry 1.8.4 at www.foursquare.com/blackberry/beta