Theory & Technique

Comments
ChrisMusic Frets: 1133
15 May, 2014
Tunings and temperaments

http://thefretboard.co.uk/discussion/16199/tunings-and-temperaments#latest

with thanks to @viz for starting another very useful and educational discussion, and to @Roland for suggesting it should be in the index.  A place I agree it deserves.
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Free ebook on scales arpeggios
http://thefretboard.co.uk/discussion/16363/free-ebook-on-scales-arpeggios#latest

help me to start learning to improvise   -  along with some interesting changes in direction, this deserves a place here too IMO
http://thefretboard.co.uk/discussion/14509/help-me-to-start-learning-to-improvise#latest
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Incidentally I believe that any of us can make a post to any of the indexes with suggestions (and URL of discussions) for consideration for inclusion.  That's what I've done anyway.  The more interesting historical information that is easily accessible here, the more useful the index is IMO.  It will be a great resource for the whole community for the future.
ChrisMusic Frets: 1133
03 Apr, 2015
Modes:

http://thefretboard.co.uk/discussion/37353/modes-a-breakthrough-for-me#latest
http://thefretboard.co.uk/discussion/17625/a-discussion-on-the-major-scale#latest
      (there are some useful links in this discussion too)

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For some diverse techniques and tones, these discussions are interesting:   (I'll add some others when I can find them)

http://thefretboard.co.uk/discussion/14978/examples-of-astounding-technique#latest
http://thefretboard.co.uk/discussion/37405/if-you-had-to-pick-the-best-guitar-tone-you-ve-ever-heard#latest
http://thefretboard.co.uk/discussion/37192/single-coil-distortion#latest