Hans Eijkenaar (a drummer famous enough to have a lengthy entry on the Dutch Wikipedia) let me know about his new app, Drum Loops HD. It is essentially just a drum loop library, but it is a really well designed library for iOS (Universal). It is even taking advantage of Audio Pasteboard to get the loops into other apps and DAWs. It seems fairly fast to navigate, find, and audition a loop in the style/BPM you want. Then one button sends the whole loop to the pasteboard.
All of the loops are performed by Hans himself, and recorded with two different mic setups. You get a modern and a "vintage" mic arrangement to choose from for every loop. This seems like a great place to start if you hate programming drum patterns, or even just to get the ball rolling with a specific groove style! Here's the intro video with Hans.