Favorite iPod Touch Application

What is your favorite application that you have installed on your iPod Touch or iPhone ? This is for iPod Touch owners who have used a jailbreak method and installed 3rd party applications.

My favorite application so far has been iBlackjack. I found it at iPod Touch Games and have been playing it non stop ever since. The game has nice graphics and is runs really well. Now all we need is an online casino site like bodog casino to offer real money blackjack games!