Hmm, you might like Little Dragon's first album. Also try Res and Esthero, they both are good singers with tight downtempo/lo-fi production. If you don't mind instrumental only projects, try looking into Cinematic Orchestra and certain albums by Stereolab.
Edit: How could I forget Flying Lotus, he's in my sig. Definitely check out Flying Lotus, I'd recommend listening to some tracks from his album LA. Very trippy, dark and sometimes with a slight hiphop feel. I thought LA was the best instrumental album of 08 (as did a lot of reviewers).