In no particular order since they are all great

Cunninlynguists - Dirty_Acres
Jay-Z - American_Gangster
Brother_Ali - The_Undisputed_Truth
Senim_Silla - The_Name,_The_Motto,_The_Outcome
Y_Society - Travel_At_Your_Own_Pace
Blue_Schloars - Bayani
Blu_And_Exile - Below_The_Heavens
Marco_Polo - Port_Authority
Talib_Kweli - Eardrum
Dalek - Abandoned_Language


Honorable Mentions :
Royce_Da_59 - The_Bar_Exam_Mixtape
Aesop_Rock - None_Shall_Pass
Lupe_Fiasco - The_Cool
Pharoahe_Monch - Desire
Kanye_West - Graduation
Wu-Tang_Clan - 8_Diagrams

Stic.Man - Manhood
Cassidy - B.A.R.S
Lupe Fiasco - The Cool
Chamillionaire - Ultimate Victory
Evidence - The Weatherman
Talib Kweli - Ear Drum
Freeway - Free At Last
Joe Budden - Mood Muzik 3.5 (MIXTAPE)
Jay Z - American Gangster

Honorable Mentions:
One Be Lo - The R.E.B.I.R.T.H
Havoc - The Kush
Mac Lethal - 11:11
Kanye West - Graduation
Ghostface Killah - The Big Doe Rehab
Beanie Sigel - The Solution