Top 5 so far:
Mastodon
Anaal Nathrakh
Madder Mortem
Devin Townsend Project
Isis
This is likely to change though, there's still a lot of seriously good stuff on the way, such as Porcupine Tree, Alice in Chains, Pearl Jam, Katatonia, Smashing Pumpkins, and lots of other stuff i'm likely to love...