Some good apps for Photos: camera plus, also Photo Studio
Games: my current faves: Doodle Jump, scramble ce, supersonic HD, pictorial, moron test, world of goo, skyburger.
Music: not much to say, but if you don't have Soundhound, get it.
And not related to any of these, RL Classic or Scanlife, for scanning stuff you see in stores to compare to online, AppZappPush and Appsmart tell you about apps on sale, and Laser Lights is fun to look at.