I have no idea why, but I've been on a HUGE rap kick lately, making my list a little, well, unusual.
Jay-Z's entire catalog
Outkast's entire catalog
Add that to
Avenged Sevenfold - "City Of Evil" (great drumming and "Sidewinder" is one of the best tracks I've heard in a LONG time)
Alicia Keys - "Unplugged"
Steely Dan - "Citizen Steely Dan" (complete collection in one box set)
Fall Out Boy - "From Under The Cork Tree"
Transplants - "Haunted Cities"