The True Temperament guitars (by Paul Guy of Sweden have actually be mentioned here before.
I've just posted a new thread that describes soem recent experiments I've done using a new approach (at least for me) that has totally replaced my previous mixed bag of adjacent string matching, harmonics, etc., built up over many years of playing. Rather than go through it here, I'll give the lick to wherever that thread winds up.
Guitar tuning, the best solution so far
http://forums.musicplayer.com/ubbthreads...not#Post2130853