I haven't spent too much time at the site, but it does appear to be mostly content that originated at ccMixter. Cool idea, but I have to admit that I will continue to spend my time combing through the amazing wealth of material at ccMixter.
We know a little about Hidden Fortress. They are from the U.K.
The name was chosen from Akira Kurosawa’s film of the same name, and because of the intended and continued secrecy of who they really are, wanting to be judged on what they do, not what they were. After an initial request from a student of Matthew’s “Wind Chill Factor” to be remixed their appetite grew, now Hidden Fortress re-mixes are spreading like a wild fire.They haven't contributed at ccMixter since July, 2006.
Today's selection includes a sample by the Beastie Boys from the Wired CD collection that was the basis for the first ccMixter contest way back when.
Hidden Fortress - We Be Gettin' Busy