Viking Smackdown from Hello Viking is a slick, fun game that's designed specifically for your iPhone or iPod Touch.  In it, you're a viking with an axe and you want to break things.  To do this turn the device horizontal to power up your toss and then flip it back veritcal to throw the axe.  It'll take you a number of tries to get the power right but once you get a few levels down you'll be doing well.

I liked this game a lot and will be playing it a bunch more to see how many levels I can get through....plus I like the whitty remarks the game makes when I screw up.