Having a hunt for some decent apps and games for my iPhone and came across this recommendation. I was ready to download the demo version, but noticed that the full version was free.
These were found via the AppStore on the iPhone itself - searching online didn't come up with a result, hence the duff link:
*** OMG! IT'S FREE ***
For a limited time only, Spikey's Bounce Around is available for FREE! Tell your friends!
Also, Monkey Flight and Traffic Rush are free "For a limited time only"
Don't ask me if they're any good - I haven't tried them yet.