Aqua Warriors Forums
Dedicated to the hobby of waterwarfare, site deals with tactics, the usual discussions, and has a small section for soaker selling/buying between members.
Digital Waterguns
A virtual gallery of a large watergun collection: hundreds of water guns of various makes, shapes, and sizes on display.
HowStuffWorks: How Water Blasters Work
Detailed explanation, with diagrams, of how water blasters work.
iSoaker.com
Includes reviews, history, facts, tips and tactics, and forums as well as water gun repair, articles, and some Flash-based games.
M15399's Super Soaker Workshop
A growing site focussing more on tech and homemade water blasters.
Super Soaker Central
Features reviews, forums, tactics, modifications, homemades, and articles.