I'm sure a year from now my list will be totally revised, but for the moment...
Radiohead: Hail to the Thief
Broken Social Scene: You Forgot it in People
Jeff Buckley: Live at Sine (Deluxe)
Yo La Tengo: Summer Sun
!!!: Me and Giuliani Down By the School Yard
Not a very strong year in my opinion but I still haven't heard a lot of stuff that's supposed to be good (Califone, Unicorns, The Rapture, Strokes, etc.)
However, the reissue of Marquee Moon made me aware of a classic that had up to that point gone unnoticed.