A novelty site, but search for Pure Boom Bap for good tunes at work.
Turntable.fm

Pretty sure since there's been no reply's that nobody has peeped this. You can access the beta if you have a friend on there as a Facebook friend (let me know and I can add you). Great way to hear new and old boom bap style rap music. If you can get passed the "kid" feel, it's pretty cool