I would second these nominations:
Menomena "Mines"
Drive-By Truckers "The Big To-Do"
Superchunk "Majesty Shredding"
Ted Leo & the Pharmacists "The Brutalist Bricks"
White Mystery "White Mystery"
Black Keys "Brothers"
Screaming Females "Baby Teeth"
and add:
LCD Soundsystem "This Is Happening"
V/A "Broken Hearts & Dirty Windows: Songs of John Prine"
Justin Townes Earle "Harlem River Blues"
Big Boi "Sir Lucious Left Foot..."
Titus Andronicus "The Monitor"
Tom Petty "Mojo"*
The Corin Tucker Band "1,000 Years"
Gorillaz "Plastic Beach"
*yes, believe it or not, it's pretty good. Except for the reggae song about marijuana legalization. I mean, come on, Tommy.