Version 1.2 of the iPhone app made it onto the app store, but I removed it after a user reported crashes on launch. I traced the problem to a rare condition when upgrading from v1.1. It wouldn’t have affected most users, but one was enough to take it offline.
I’ve meanwhile fixed the bug and submitted v1.2.1 to the app store. If all goes well it should be available for download in about a week.