I couldn't narrow it down to a list of ten, so here's my favourite albums from the past year (in no particular order):
Emm Gryner - Goddess
Green Day - 21st Century Breakdown
Keith Urban - Defying Gravity
Bruce Springsteen - Working On A Dream
U2 - No Line On The Horizon
Kelly Clarkson - All I Ever Wanted
Megadeth - Endgame
Manic Street Preachers - Journal For Plague Lovers
Martina McBride - Shine
Placebo - Battle For The Sun
Powerman 5000 - Somewhere On The Other Side Of Nowhere
Stryper - Murder By Pride
Metric - Fantasies
Chantal Kreviazuk - Plain Jane
Honourable mention to Metallica's Death Magnetic. It actually came out in September of 2008, but I'm still listening to it on a regular basis. With the decade coming to a close, I'd have to say it's probably the best album I've heard during it.