Below are some links to maufaturers, kit plans and general DIY info!! Have a link drop a line with the link and I will add it!
Loudspeaker LAB measurement and design software. Download your free demo today!!
Solen - Kit plans, driver specs
Orca Design - Plans, driver specs.
Zalytron - Kits, plans, US parts dealer
Speaker Builder - Plans, useful DIY info
Madisound - Discussion board, US parts dealer
Transmission Line speakers - Plans and useful TL information.
Old Colony Sound - Books,magazines,software, and tools for the DIY'er.
Parts Express - Discount drivers and surplus parts.
The Parts Connection - A source for highend caps and inductors as well as tube related parts.
JPO's Speakerbuilding List- The most comprehensive list for the DIY'er.