404 GURPS Gulliver - Gulliver is the most comprehensive re-examination of the GURPS rules on the net, covering Size, scaling and stats; shrinking and growing; flight, and literally dozens if not hundreds of other topics.

Converting A Campaign To GURPS - An article on making the move to GURPS from another system, using the author's Mechwarrior conversion as an example. From Roleplayer 19.

D 3.5 to GURPS 4th Edition - Character conversion formulas by Bruce Grubb.

Gunmetal Blue: A Truly Badass GURPS Page - A page devoted to using GURPS as the ultimate system for cinematic action roleplaying, recreating the exploits found in anything from Terminator 2 to Hard Boiled.
Meta Description: [ A page devoted to using GURPS as the ultimate system for cinematic action roleplaying, recreating the exploits found in anything from Terminator 2 to Hard Boiled ]

GURPS Gladiators - A standalone combat boardgame using the GURPS advanced combat rules. Also useful as a GURPS teaching tool.
Meta Description: [ Gladiator GURPS Boardgame ]

GURPS Ground Zero - A large collection of realism-oriented rules options, mostly focused on combat.
Meta Description: [ GURPS Ground Zero dotcom site: lots of groundbreaking rules, campaigns and characters. ]

GURPS Sex - A mini-netbook discussing everybody's favorite topic, by Tim and Christine Morgan, who presumably playtested it.

404 MyGURPS - House rules, sample writeups and traits, GM aids, and reviews.

Richard's Cavalcade of Whimsy - GURPS variants and random monster abilities.
Meta Description: [ domibia, titania, role, playing, games, GURPS, CRUNCH, rpg, world creation, d20, D&D, dungeons and dragons, Tri-Stat dX, dX ]

Self-Esteem and Repartee in GURPS Swashbucklers - Steffan O'Sullivan's adaption of an innovative concept from Lace Steel, neatly ported to GURPS.

Unlimited Mana - Originally printed in issue 9 of Pyramid magazine, this GURPS Magic variant is one of the most popular in the history of the game. Includes a PDF version of the Calamity Table.
Meta Description: [ The original article from Pyramid #9, expanded from more year of play and fan feedback. ]