I can't believe I've come onto this forum only to discover that no-one has yet posted anything about the Android app DSLRDashboard!
It's an unbelievably useful app which will control your camera remotely (and even wirelessly if your camera uses Wu-1A or Wu-1B.
Some guys have even hacked it for cameras it's not meant to work with.
What's more, it's free! Check it out on Google.