I'm not familair with what he's done lately but I have always been impressed with the creativity and versatility. He does hip hop(Prince Po, MF Doom, Jemini the Gifted One) as well as pop stuff.
I've always wanted to do a mash up project but I was unable to juggle my college load, music and a girlfriend at the same time. I considered them more like Concept Albums. I had started working on two projects simulatneoulsy;A Bob James Concept album and a Christmas Album from various Christmas songs. Sampling beatles tracks to rap accapellas is not as easy as it sounds so I always respected him for that. I only like a few of the songs but I understand he was limited to the tracks on the Beatles white album. Just imagine if we all on FP were forced to do the same project. That would be interesting(lol)