He has this book out that has been around for awhile (THe Guitarist's Guide to Composing and Improvising) which is incredible. It is essentially the unconventional approach to guitar playing, probably for someone who has been playing awhile, but needs some seeds for creativity. It's not about shredding or technique either, it's all about musicality and imagination, and infusing that in your playing.
You can check out a lesson that he wrote (which is used in his book) here -
http://www.berklee.edu/bt/153/lesson.html
The entire book can be ordered here -
http://www.berkleemusic.com/store/product?product%5fid=11399&usca%5fp=t
While it is geared more for jazz than anything else, it's lessons can be applied for anything, I've used them in a lot of jam band situations.
aight, lata guys...
There are only two important things in life - There's music and theres girls, not necessarily in that order....
The Ace's Guitar Tricks
The Ace's Guitar Tricks