I used jQuery Mobile to build the mobile web interface for http://IOUmate.com because I really like the general approach jQM is taking. It allows you to build a mobile view to a web app instead of creating a separate, monolithic mobile app. jQM makes it easy to provide device-optimized views for URLs instead of requiring custom URLs for different devices. This makes all the difference for an app like I.O.U. Mate which sends out notification emails with plenty of links to different resources (in our case, friends and IOUs). These links just work (without redirects) whether they're opened from a desktop or mobile mail client.

I'm looking forward to upgrading I.O.U. Mate to jQM beta very soon, since there have definitely been a few rough spots with page transitions and navigation. However, I'm very impressed with the progress that's been made with each release and the overall direction of the project. Nice work, jQM team!