SSX Blur is great, and so is Super Swing Golf. Super Swing Golf Season 2 was just released a few days ago, and if it's half as good as the first one we're in for a treat.
If you wanna get your zombie holocaust on, you can't go wrong with Resident Evil: The Umbrella Chronicles. It features two-player co-op play, it expands the story of the RE universe, and honestly, it's just plain awesome. It reminds me of the old on-rails shooters that I used to play in the arcade all the time, like House of the Dead.
If you want things to play w/ the wife and family, grab a copy of Mario Party Whatever-number-they're-up-to-now, 'cause it's not too bad, really. Bust-A-Move Bash is supposedly pretty good, but as easy as all-get-out. Rayman Raving Rabbids is supposed to be pretty good, but it honestly never appealed to me.
Oh, Excite Truck! Your son will LOVE Excite Truck!