The best album of 2006 IMO: Wolfmother - Wolfmother

A close 2nd: Muse - Black Holes and Revelations

Other awesome releases in 2006:

The Beatles - Love
David Gilmour - On an Island
Gorillaz - Demon Days Live
Sam Roberts - Chemical City
Pearl Jam - Pearl Jam
Red Hot Chili Peppers - Stadium Arcadium
Neil Young - Living with War
"Weird Al" Yankovic - Straight Outta Lynwood
The Who - Endless Wire