[This is a recent blog post of mine from here: http://uxformobile.com/mobile-pattern-galleries -- I'll replicate it here:]
I've stumbled upon several different mobile UI pattern libraries over the past few weeks and thought I'd compile a list of them to share:
http://androidpatterns.com - Android-centric, but also an excellent example of what (at least in my opinion)is a quality pattern library should consist of: wireframes, examples, clear description and specific dos and don'ts.
http://pttrns.com - screenshot gallery of iPhone applications .
http://mobile-patterns.com - similar to pttrns.com but with more vowels
http://lovelyui.com - another gallery of screen shots.
I'm still on the fence as to whether I like Dribbble or am annoyed by it (maybe I'm annoyed because no one has invited me yet), but it can also be a source of mobile inpsiration as well when browsing via some of its tags: