All the usual popular games (angry birds, cut the rope, smurfs etc)
Any free military/weaponry/aircraft stuff I can find
All the speed anatomy/bones ones. Oo and 3D brain is cool!
Photoshop express for cropping pics before I post them
Twitter/facebook/livejournal/tapatalk
ebay/paypal/amazon
Rowmote (love laying on the couch and controlling my computer!)
Movies - keeps track of my embarrassingly large collection of DVDs...
Hours Tracker- like a digital punchclock for the hours you work, works out daily/weekly pay etc. Can even email to yourself. Handy when the boss was a rip job!
Oh and of course the built in iPod for tv shows!
yeah, I nearly went stir crazy without my phone for 2 weeks when I broke it...