The Blue Scholars is a Seattle rap duo. I just listened to their album Bayani, it's among the best of 2007 thus far, check my RYM review for more details.
For more info, here's the Blue Scholars' website, myspace, wikipedia, RYM
Props to Rap Dungeon, who mentioned this group & has a preview link. Like always, it's only for preview, buy the album if you like it, etc.