Infinity Blade is 99 cents again for a limited time. iOS Universal app so it works on both portable devices (iPhones, iPod Touch's) as well as tablets (iPad 1, 2, the new iPad).
Pretty boring game, but is a nice eye candy game for showing people what your i-device can do.
Bought this on my 3GS and it keeps crashing. Doesn't even stay up 5mins.
Note I have no other applications running.