If some readers do not know yet, the first major digital archive of guitar music is the
Rischel & Birket-Smith Collection of the Royal Library of Denmark. The last items of the collection went online about 6 months ago. The Library of Congress has over 1000 items of guitar related material in their
Music for the Nation website. The Music Library of Sweden, Royal Irish Academy of Music and Washington University in St. Louis, USA are also working on digitization projects.
Though I have already created a tool to ease download of the Rischel collection I called RIBS2, a more fully featured web version will show up here. It will be part of the Archive section of the site which is still under construction. Digital Guitar Archive will be a portal for searching multiple digital archives.
As the services go online we hope everyone will post feedback to help us create the best tool possible.