This is probably already done in a way, but...
I suggest a separate techniques category for people to start first from a lesson on how to do a technique, for example 'how to palm mute', 'pinched harmonics', 'vibrato', etc.
Explain it by text and maybe some images, also possibly linking off to the video exercises.
People can then reply with their questions, problem areas, and answers and have the topic grow and develop, like so.
It would make it easiler to learn and find content?
For example:
http://www.guitarmasterclass.net/guitar_fo...showtopic=27738