For a relatively simple party game, check out Target Toss Pro in the WiiWare stuff online. It's made by the folks that do Golden Tee. It's video cornhole. It's also pretty much exactly like the one in bars. (Not as popular as Golden Tee, but there's a few in Knoxville nowdays.)
I'd also recommend World of Goo in the same area. Fantastic game that's sort of like Lemmings. Excellent presentation and all around game.