Update Sept 25, 2012:
From 2 Dope Boyz comes the following:
-Ludacris, 1.21 Gigawatts. Considering it's free give it a listen or 2. I didn't find it to have much replay-value though.
-Asher Roth, Pabst and Jazz. Better than I expected for a free mixtape from someone I don't hear much about. In fact I'd call this one very good.
-Tech N9ne feat. Hopsin, "Am I a Psycho".
Hopsin, RAW, Youtube playlist, and/or buy it at Amazon. This guy is really good. I may yet add him to the very short list of artists that I currently follow.
Mac Lethal has a great video on Youtube rapping to "Look at Me Now."
Grieves, Budo and K.Flay's "Lost in the Sun" via Stellar Figment. K.Flay has a solid voice, but I think her beat-making skills (I Stopped Caring in '96) could use some help.
Just because it's on the radio doesn't make it bad music. Jay-Z and Kanye's Watch the Throne is very, very good (youtube playlist).