Ah finally some iPhone app to simultaneously check in on Foursquare, Gowalla et al. http://www.check.in/
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Ah finally some iPhone app to simultaneously check in on Foursquare, Gowalla et al. http://www.check.in/