Here's a great video where funk guitar virtuoso Nile Rogers talks about his style and his collaboration on the latest Daft Punk record Random Access Memories. Nile just oozes groove, which too many guitar players don't get, unfortunately.
Another thing to watch is how well this video is done, especially the editing. It's a good template to work from if you're editing your own videos.
I recently read Chic guitarist/producer extraordinaire Nile Rogers' book, Le Freak: An Upside Story Of Family, Disco, And Destiny, and came away plenty impressed with what Nile overcame to rise to become one of the the top hitmaker's in the world. I think I liked Keith Richards' Life a little better as far as the amount of juicy stories, but Nile's book really looks into an era of music that isn't talked about much (meaning the "Disco" era). Regardless whether you like the music of Chic (I personally do), there's no denying that Rogers had a huge impact on the world of popular music as a producer.
One area that Nile really knows is funk, and in the following video, he gives probably the best lessons I've ever seen on what is funky and what isn't in terms of playing. This should be a must see for every guitar player, regardless of if you play in the genre or not.