Searching the forum topics, I noticed there wasn't much discussion of blowguns. Though I doubt they'd prove effective against Zombies, they could be useful in the PAW for small game hunting and pest control, when ammo conservation is a must. So, I thought I'd provide some links to some useful sites.
Incidentally, I highly recommend Extreme Blowguns's .50 cal. Tuff-Ram, ColdSteel's .625 cal., and Primitive Weapons' .68 cal., all of which I own and shoot regularly. The last two double as walking sticks.
http://www.extremeblowguns.com/
http://www.blowgunsnorthwest.com/
http://www.primitiveweapons.com/home.html
http://www.enter.net/~craftsman/nsba/nsba.htm