Here's some links to other blowgunners' sites
Blowgunhunter Has instructions on blowgun and dart making as well as some cool hunting/fishing photos.
WindRush Has good instructions on cutting a #2 or #11 blade, and dart making instructions.
Here's the Blowguns Northwest Message Board
Here's some retail blowgun sites
Here are some suppliers of blowgun making materials.
Tower Hobbies Lots of good blades.
e-Hobbies Has that saw blade and #2 and #11 blades.
Online Metals Will ship you a single aluminum tube!!
Composite Spars and Tubes has Carbon Fiber Tubing. It is expensive, and the company is in Australia.
If you can think of any other links that would be helpful, please e-mail me.