Any particular icon sets that you like to use for mobile UI?
I love Entypo http://entypo.com/
No designer can be without Pictos, great base for icons if you're working in Photoshop and great as a set. Big fan of Geomicons as well!
+1 for Entypo
Meagan Fisher (owltastic) has a great round up: http://owltastic.com/2011/08/simple-interface-design-icons/