Links
http://home.teleport.com/~pua/index.html The Portland Ukulele Association (PUA) The center of ukulele happenings here in the Portland area. Super friendly people and lots of fun.
http://www.luth.org/ The Guild of American Luthiers. Based right here in the northwest, Tacoma Washington. Provides vast amount of info to instrument builders of every level.
http://www.guitarmaker.org/ Guitarmaker. The other Luthier rag. Geared more towards professionals. Less how to articles, but lots of fun stuff.
http://www.EarlyMusicalInstruments.com/ Early Musical Instruments. Great catalogue of early musical instruments for sale. Check out the section on Romantic period guitars.
http://www.atlasofpluckedinstruments.com/ Great resource if you are trying to find some obscure stringed instrument.
http://www.provide.net/~cfh/gibson.html Lots of great Gibson info. Geeky stuff.
http://www.frets.com/ Guitar repair guru Frank Ford shares his vast knowledge of the world of guitar repair and restoration. A must for those who are serious about guitar repair.
http://www.fleamarketmusic.com/ All things ukulele.Jim Beloff has a very nice site.I especially like the Q&A vintage corner run by Chuck Fayne. Chuck probably knows more about vintage ukes then anyone I am aware of.
http://www.harpguitars.net/ This is Harpguitar central. More info about the Harpguitar world then you can imagine. The Harpguitar is alive and well!
http://www.mugwumps.com/ Before there was yahoo, before there was google, before there was the internet even, was Mugwamps. Tons of great info on early american stringed instruments.
http://ukulelefriend.com/Lots of really fine new and vintage ukes for sale.Shawn is a super nice guy and always helpful.
http://ukulelestrummers.com/ Great web site for uke cords and a bit of instruction on the side.