The most excellent Phoenix Wright: Ace Attorney is now available for the iPhone (and other iThings), and it's only $4.99. Woah!
Already have it on the DS? WiiWare? That's cool, why not get it again on a device where you can play it and maybe have a high-profile court case interrupted by a telemarketer? The iPhone version also features "a new flick interface" that will let you manage, cross-reference, and organize evidence with your finger.
At only five bucks, it's almost silly not to pick this one up on the App Store. Which is what I'm going to go to right now, actually.