Nice Noise: Modifications and Preparations for Guitar is a must have book for anyone into experimental guitar. If you enjoyed the post Extended Techniques with Roger Kleier (who is name checked in this book), and want to learn more about extending your techniques, look no further than this slim tome by Bart Hopkin and Yuri Landman.
Seattle’s Bill Horist has a range of extended techniques that is awe inspiring. In performance at the Stone in New York he turned in a perfect forty minute set that never flagged in inventiveness and musicality. His command of textures and dynamics is rivaled only by Norway’s Stian Westerhus. Here is a full set from July of this year that is a master class in looping, and abusing a guitar with a variety of implements.