sonicspecialists...but not what you're looking for..a bit too newschool but super crisp, among the best i've ever heard.. (not free)
Hiphopst.blogspot.com (free and great)
warbeats.com if you are a member.. you wil have to dig into the packs tho... not evrything sounds good... especially if you wnat some pro sounding and engineered stuff...
you can ask on gearslutz.com it's the lair of audioengineer on the net, some having been working with the starz..