Fuzzle is a great looking puzzle game and it's free at the moment. Normally $1.99 which it's more than worth, but for free is amazing. Give it a try. [AppStore]
I really like being updated on Apps that are on sale or going to be increased in price - even though I don't currently own an iPhone or iPod touch I am downloading to iTunes now for when I eventually get my hands on one.
It seems that the price in the US shop was not updated to FREE yet, probably some Appstore caching problem since I see it free in some categories like in the puzzle category. Should be fine in some hours, I have seen this happening before.