I have a lot of favorite board/card games. I often bring way more board games than we could possibly play in one sitting, mostly because I like to give the other players a choice. Whatever I bring I'm perfectly happy to play.
Some of my more commonly grabbed games are:
Dominion (natch), Thunderstone, Pirate's Cove, Red November, Thurns and Taxis, Race for the Galaxy, Robo Rally, Smallworld, Galaxy Trucker, Dungeon Keeper, Filthy Rich, Puerto Rico, Advanced Civilization, Kingsburg, San Juan, Power Grid, Factory Manager, Evo, Betrayal at House on the Hill, Revolution, Carcassonne, and Nanuk. Also, if I own the game, I most likely own the expansions.
A friend of mine has some board games that I haven't picked up yet, such as Le Havre, Endeavor, Cuba, and Cargo Noir.
I do far less video games than I used to. I rarely buy games as soon as they come out (Portal 2 being an exception). I can usually wait until the hype dies down and scour Steam for some deals (I purchased GTA4 for under $10 during one crazy sale).
Kevin