2010 has been a good year, but 2009 definitely topped it IMO. I'm still waiting on my copies of the new Electric Wizard & Deathspell Omega so those could replace something, but here is a tentative top 15:
Enslaved - Axioma Ethica Odini
Triptykon - Eparistera Daimones
Odem Arcarum - Outrageous Reverie Above the Erosion of Barren Earth
Negură Bunget - Măiestrit
Withered - Dualitas
StarGazer - A Great Work of Ages
Inquisition - Ominous Doctrines of the Perpetual Mystical Macrocosm
Immolation - Majesty And Decay
Agalloch - Marrow of the Spirit
Imperium Dekadenz - Procella Vadens
Winterfylleth - The Mercian Sphere
Vasaeleth - Crypt Born & Tethered to Ruin
U.S. Christmas - Run Thick In The Night
Horn - Distanz
Hooded Menace - Never Cross the Dead
Honorable mention: Woe - Quietly, Undramatically