Luthiers and Woodworkers
Matthias Wandel
Great site--things you'll see nowhere else--computer-controlled box joint jig, home-made pipe organ, etc.
Kathy Matsushita
The best online resource for the hobbyist or first-time guitar builder. Step-by-step instructions, sources, and friendly advice.
Jack Loganbill's Woodshop
Lots of excellent information: shop tour; kayak plans; video demonstrations; tool reviews, including dovetail jigs, routers, miter gauges, and Jack's take on the Shopsmith 510.
Joe Woodworker.com
Talented woodworker and very informative site with shop tips, project gallery, veneering information, shop tour, and tool reviews.
SawdustandShavings.com
John Carmona's woodworking site. Features tool reviews, project ideas, good advice, and interesting opinions.

Banjo Building Supplies
First Quality Musical Supplies
Stewart-MacDonald

Woodworking Supplies
Garrett Wade
Woodcraft
Highland Hardware
www.VeneerSupplies.com
Discount veneering supplies from Joe Woodworker

Woodworking Videos and Plans
New Yankee Workshop

Musical Instruments/Instruction
Mugwumps Online
Lots of useful information on a variety of banjo topics.
Elderly Musical Instruments
My favorite source for new and vintage instruments
C.F. Martin & Co. (Martin Guitars)

Other Great Links
WoodNet
Woodworking Tips, tool reviews, woodworking links, plans from Woodsmith, Workbench, and ShopNotes, and the place to order the plans that I used to create my box joint jig. Click here for box joint jig plans.