I wouldn't say I hear new stuff comprehensively enough to purport to assemble a best-of list, but five of my favorite new albums of the year, in no particular order, were:
Silver Jews, Tanglewood Numbers
Fiery Furnaces, EP
Sleater Kinney, The Woods
New Pornographers, Twin Cinema
Go-Betweens, Oceans Apart
New 2005 albums that come to mind right now that I liked enough to play for a bit but not enough to put on the list include those by Spoon, Stephen Malkmus, and Broken Social Scene.
I would have included the Belle and Sebastian EP/singles compilation, Push Barman to Open Old Wounds (better than their last new album) except I already had all the tracks and thus didn't buy it.