Here is a list of links I've come across that viewers of this sight might find interesting.

General
The Miniatures Page

Computer
Sketch a Wargame Battle Board (free online map generation tool)
ProFantasy Software (map generation software)
The Wolf Lair (Army Builder)

Dirtside 2
Ground Zero Games (makers of Dirtside II)
Andy Cowell's Dirtside II Page
Brian's Wargame Pages
Deathskulls Dirtsdide II Page
Far Futures
Full Thrust Network (including Dirtside II)

Games Workshop (Epic)
Games Workshop
Games Workshop Specialist Games
Forge World
Arcturas Stronghold
Book of the Astronomican
Dropship 40,000
E41k
Epic 40,000 Webring
Epic 40k.com
EPICenter (home to NetEpic)
EpiCollector
Epic Mailing List
Felix's Gaming Pages
Graham's Wargaming Page
GWGateway
Laitus Prime Tribune
Liber Imperialis
The Maelstrom
Markco's Epic Page
Picture Index (GW Minis)
Titan Project
Ultimate GW Links
Weirdboy
www.epic40k.co.uk

Historical/Modern
C in C Miniatures
Command Decision
GHQ Models
Old Dominion Game Works (Mein Panzer)

Military
Map Symbols
Military Analysis Network
Osprey Publishing
StrategyPage.com
Technical Virtue
Tips on Writing Military Science Fiction
WWII AFV Portal

Other Science Fiction Miniatures
Brigade Models
Days of Empire
Force XXI Miniatures
Geo-Hex
Gladiator Games
OGRE

Terrain/Buildings
Battlefield Designs
Fiddler's Green
Geo-Hex
Germ's World
Higher Ground
JR Miniatures
Mech Depot
Microfigs
PMC Games
Timecast
Wargames Figure Company
War Zone