Read this for a great synopsis and An Introduction to GURPS
The Blind Mapmaker Does a lot of reviews.
MyGURPS by PK the assistant line editor.
GURPS Repository GURPS Wiki
Gaming Ballistic Third party publisher with lots of great stuff
Adventures, Monsters, and Foes
Animalia in GURPS Stats and details for lots of animals.
Northport - Adventures in Designing a GURPS Dungeon Fantasy Setting
The Lands of Nandeme: A Hexcrawl for Dungeon Fantasy
Gear and Loot
GURB - The Generic Universal Roleplaying Blog Lots of stuff on futuristic weapons.
Shooting Dice Guns and Gaming, including scenes from movies - how to play them out and stats for the weapons, even charecters.
Misc GURPS Related BlogsDungeon Fantastic
Game Geekery by Mook A good introduction and general aid to using GURPS.
Hard Maths Sci Fi themed blog
Mailanka's Musings Campaign building
Ravens N' Pennies by Ghostdancer a popular GURPS author