Here is a list of guitar-related sites which may be of interest to you:

www.kresse-gitarren.de (Bernhard Kresse - a fine German Luthier specializing in historic guitars)

www.evansamps.com (Evan's Custom Amplifiers - see my name on their list of "Artists")

www.maplestreetguitars.com (George Petsch - Atlanta, GA)

www.stringsbymail.com (My favorite string supplier)

www.earlyromanticguitar.com (A great site for 19th-Century Guitar by Len Verrett) 

www.schnabl-gitarrenbau.de (Gerhard Schnabl - another fine German Luthier)

www.tecla.com  (Retail site for some 19th-Century guitar editions - Dr.Brian Jeffery)

www.chanterelle.com  (Another site for guitar music publications - Michael Macmeeken)

www.guitarfoundation.org (check out the ARCHIVES/RESEARCH link on left of Home-Page - "the search strategies outlined in the Research Resources Online pages were prepared and are currently maintained by Thomas Heck")