Motion-X Poker (or "Poker Dice" as I've called it on the TechChatter podcast) is probably my favorite iPhone game so far. It's simple, good-looking, and addictive. There are over 30 dice sets to unlock, there are acheivement "gems", different tables with increasing bet amounts, etc. The interface is intuitive, and the physics, animation, and sound are near perfect. Dice roll like actual dice. Dice with rounded corners behave differently than cubed dice. Dice of different materials sound differently when rolled on tables of different materials. It's the subtle things that make this already-wonderful app shine through.
And I'm bitter. I paid $4.99 for it, but now they've lowered the price to only $0.99.
I'm not that bitter though. I've gotten far more than $5 of fun out of it. It's better than many of the $9.99 apps I've seen or tried. I certainly have no regret having paid $5 for it.
Only $0.99. That's a third the cost of several tip calculators on the app store. Yes, I know... I'm pimping this game pretty hard. For all the junk in the app store, software like this deserves good word-of-mouth.
So pick up this $4.99 app for only $0.99. I saw the story on Touch Arcade, and it didn't seem to indicate it was only temporary, but given some recent temporary sales from other app developers, I'd snag this now. This demo video will give you an idea of what the game is like, though it's far better in-person.