Things I really liked this year:
Slaying Stone - In my opinion, probably one of the best adventures WoTC ever published.
D&D Essentials Rules Compendium - It's a great buy and with the index and soft cover, finding something is a snap. Fine example of taking lessons learned being applied in a low cost form factor.
Gamma World - Lots of fun, zany mayhem, and you really don't need the cards to play the game.
and something not purchased but still really cool:
D&D Encounters program: Really a win for the FLGS and the players, because the store gets product 10 days early, as do the players... and a great serialized adventure series for weeknight play. This is really a very good program, I encourage you to check it out if you have it running nearby (and also support the FLGS with purchases of course!)