Stacked features the titular professional championship player, Daniel Negreanu, but other pros also make an appearance, including Evelyn Ng, Juan Carlos Mortensen, and Erick Lindgren. The game's style of poker is Texas hold'em, which is the style that made Negreanu famous through the World Series of Poker.
The PC's online mode is hosted by MTV. The initial release for Xbox contains a serious bug that causes player data to be reset when playing on Xbox Live; a patch is available to fix these problems.
Source: Wikipedia, "Stacked with Daniel Negreanu", available under the CC-BY-SA License.