The Official Wiki The built in Wiki for the game, you can access this Wiki in game by pressing F10. Not as comprehensive as the unofficial one, but still quite a bit of information.
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Guild Wars On-Line An impressive fan site wth lots of information regarding, builds, professions, quests, missions and more including help and support forums and an Auction site.
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Guild Wars Guru Another impressive fan site with even more information (than you can probably poke a stick at), including forums and auctions.
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PvX Builds A site dedicated to creating builds for Guild Wars. Instead of spending hours fiddling with skills, search here to find something that others have tested and found works. Good ideas for hero builds as well.
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Pre-Searing Community Wanting ideas on keeping a perma-pre character? Here's some tips on how to achieve that elusive Legendary Defender of Ascalon Title. A whole community including videos, forums and articles on Pre-Searing Ascalon
