There hasn't been any annoumcenet of it yet on Gowalla's blog, but it's being reported across the tubes the checkin service has been bought by Facebook. Seems I jumped ship just in time.

I wish the team the best of luck in Palo Alto, and hope they do the right thing and allow us to easily export our checkins. Our Atom feeds have been dead for months and their promise to "definitely" develop export tools have gone unfulilled. During early 2010 I used Gowalla to track our last journey through Europe, and would desperately like to not have that stuff lost.

UPDATE: Was about to take a crack at their API, but then rediscovered the gloriously named Got my checkin history emailed to me in a JSON file. Brilliant! The Hairy Lemon!