Here's a quick list of links & resources that you might find useful for Guild Wars. There are a few general and getting started style links to official and unofficial sites, as well as links to skills info and discussion forums for the experienced player.
Guild Wars Official Website
Guild Wars official FAQ
Guild Wars online manual
GWOnline.net forums - Main Index
GWOnline - Articles listing
Character Progression
Skills Trainers - who sells which skills
Guildwarsguru Builds Directory - suggested builds, with occasional in depth reviews/comments
Guild Wars - Maps
Guide to Pre-searing Ascalon - info on quests and skills, and what to do in order to get out of pre searing Ascalon as fast as possible without missing out on anything useful.
Elite Skills Locations
Crystal Desert Collectors - who gives which rewards for which items + their locations
These profession guides have a quick summary of the profession, and also a list of their skills and what they do. Seeing as the game is mostly skills driven, this is useful info to have! Each skill from the list also has a link to an availability page, which will tell you which quest from which NPC you'll need to perform to obtain the skill.
Elementalist - overview and skills list . Elementalist strategy forums
Mesmer - overview and skills list . Mesmer strategy forums
Monk - overview and skills list . Monkr strategy forums
Necromancer - overview and skills list . Necromancer strategy forums
Ranger - overview and skills list . Ranger strategy forums
Warrior - overview and skills list . Warrior strategy forums
Sell dye to the dye vendor for a pld cash injection
Focus on skills - don't get caught up in the traditional MMO thinking of needing to level
Comments, queries, suggestions or theories? The list is continually growing, so please feel free to add any links you think should be here in the comments section, and I'll update the main post!