Info Sites
www.warpig.com - Information on almost everything paintball - A MUST read.
www.docsmachine.com - One of the best airsmiths around, with his own Tech Forum and webcomic.
www.mcarterbrown.com - Old school guns and everything related
www.vintagerex.com - The ongoing paintball history archive project, definatly worth a look!
paintmagazine.com -  Location to find the Christian Paintball Players Assoc. (CPPA) , Palmers Owners Group (POG), etc.

Spyder Related
www.kingmanusa.com - Makers of the Spyder line of Paintball guns.
www.ottersccustoms.com - Good site on tweaking your Spyder paintball gun.
www.aftdesign.com/sog/ - The Spyder Owners Club

Smartparts (Shocker, Impulse, Nerve) Related
www.smartparts.com - Company home
www.shockerowners.com -  Shockers mainly, but anything SmartParts is welcome.
www.impulseownersgroup.com - Registration required, name says it all.

Sheridan VM-68 (PMI-3) Related
www.vm68.com - Everything you could possible know about the VM-68.

Automag Related
www.automags.org - Automag Owners Group (also big on Angels over there)

PMI related
www.pminetwork.com - Makers of the PMI "Pirana" Paintball Guns
www.rps-paintball.com

Custom Work
www.palmer-pursuit.com - Probably the best custom guns in the world, along with matching service.
www.punishers-customs.com - Blessed by CCI, maker of some awe inspiring Phantom pumps, and a few other crazy customs.
www.scarecrow-paintball.com - Custom work and parts for classic guns, Good stuff and nice guy
www.airsoldier.com - Hard to find parts (like impulse 'noids) Tribals, and all around good guy. Dig around and find his online paintball museum

Autococker Related
www.armyoforr.com - Manufacture's of the original Sniper pump and Autococker gun lines.
www.air-powered.com - If its a 'Cocker, they can help you fix, upgrade, and speed it up.