Dominion is a deck building game where you try and have the most victory points at the end of the game. Each player has their own deck they build up by buying cards from the Supply (cards anyone can take from). You have action cards (do stuff), treasure cards (buy stuff) and victory cards (use towards victory points).
Also, there's a free iPhone app for Dominion. It plays really well and is a great way to see if you'd enjoy actually buying the real game.
It's a ton of fun and anyone who like Magic The Gathering or anything like that would definitely enjoy it. Anybody here play?