The Wake Publishing Company has information on books and video tapes by SCAVM founder Harry S. Wake.
Henry Strobel gives information on his books on violin making, has a series of pictures showing the varnishing of a cello, and has information on instrument setup and instrument care.
The Music Trader has a great deal of information on sources of materials. There are also some practical articles by Lars Kirmser including an extensive piece on Fitting the Bridge and the first in a series called Building a Violin.
Hans Weisshaar & Margaret Shipman spent 10 years writing Violin Restoration: A Manual for Violin Makers. The book provides a thoughtful and detailed approach for a lot of complex repairs. This is the authoratative book on violin repairs and restoration.