GW2: Halloween in Four Acts

Guild Wars 2's Halloween event is called Shadow of the Mad King.  The event unfolds in four acts.  There are also items to purchase.
https://www.guildwars2.com/en/events/halloween-2012

FAQs summary with tips in the comments
http://www.reddit.com/r/Guildwars2/comments/11xmus/faq_for_the_halloween_event/

You need to collect clues for the first act.  Here's a guide for part one.  The instructions are confusing so the next link also is a guide to part one.
http://www.almarsguides.com/gw2/GettingStarted/Halloween/

http://dulfy.net/2012/10/23/shadow-of-the-mad-king-scavenger-hunt-guide/

This is what the official wiki says, with lists of decorated outposts, lists of quests and items, including headgear, and the NPCs involved in the special event.
http://wiki.guildwars.com/wiki/Halloween

Here is the achievements list in case you collect them.
http://wiki.guildwars2.com/wiki/Special_Event

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Guild Wars 2: Traits and How They Work

Traits are explained on the official wiki.  Once you are level 11, you can buy a manual that unlocks the ability to spend trait points.  As you level, a new trait point is achieved.  You will have to buy a new manual to unlock spending trait points again at level 40 and 60.  There are 70 trait points available.  More details and trait lines listed by profession here.
http://wiki.guildwars2.com/wiki/Trait

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Guild Wars 2: Traits and Attributes Explained

A developer explains how traits and attributes effect characters.
http://guildwars2ranger.com/articles/guildwars-2-traits-and-attributes-explained/

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Guild Wars 2: What are Back Items?

Back items are things like backpacks, capes or back braces (which can hold an additional upgrade).  They can go in an equipment slot in the hero panel.  Engineers get a backpack starting out while others pick up backpacks as quest items in their storyline quests. Some back items can be made by a Guild Armorer that display the guild emblem.  Details and links about various back items are here.
http://wiki.guildwars2.com/wiki/Back_item

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Guild Wars 2: Navigating the Mess that is Rata Sum

The mix of Rubik's Cube and Escher lithograph that is the asura's starting zone called Rata Sum is a horror to navigate, although I am told there are golem that will give directions.  Here is the best guide to the city I've found.  Make sure you click on the tiny map to enlarge it.
http://www.postcount.net/index.php?pageid=tdwratasum

Here is a list of locations.  Note that there is no information available for most locations if you click the links today.
http://wiki.guildwars2.com/wiki/Rata_Sum

Here are videos of where all the vista points are located, which also may help you navigate Rata Sum.
http://www.youtube.com/watch?v=6LI7FQGwACc

http://www.youtube.com/watch?v=R47OMKGagYM&feature=relmfu

http://www.youtube.com/watch?v=GGJsvH98dOs&feature=relmfu

http://www.youtube.com/watch?v=w1JsrQN52mg&feature=relmfu

http://www.youtube.com/watch?v=aXXyeBFLfwY&feature=related

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Guild Wars 2: Engineer Flamethrower Builds

Here are a series of flamethrower builds for the GW 2 engineer.
http://www.guildwars2guru.com/topic/65257-flamethrower-build/

PvE flamethrower build
http://www.guildwars2guru.com/topic/62529-ajanils-pve-groupgrinding-flamethrower-powercrit-build/

Another take on the flamethrower build
http://www.guildwars2guru.com/topic/67960-my-flamethrower-build/

Are turrets or elixirs better for the flamethrower build?
http://www.guildwars2guru.com/topic/66826-flamethrower-turrets-or-elixirs/

A flamethrower build complete with video for those who need more than the written word.
http://guildwars2engineer.com/engineer-builds/new-gw2-build-burning-condition-engineer-flamethrower/

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Guild Wars 2: Weapon and Armor Stats Explained

http://www.guildwars2junkies.com/2012/08/23/guide-weapon-and-armor-stats-explained/

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Guild Wars 2 Weapons

Ten Ton Hammer talks about how weapons work in GW2.
http://www.tentonhammer.com/gw2/guides/basics/weapons

Here's a guide to making Legendary Weapons, with pages and pages of comments.
http://www.guildwars2guru.com/topic/64363-legendary-weapons-guide/

A list of all legendary weapons in GW2, plus crafting recipes and the "gifts" needed.
http://segmentnext.com/2012/08/30/guild-wars-2-legendary-weapons-crafting-recipes-guide-gift-recipes-and-where-to-find/

A guide to weapons for Necromancers.
http://www.necrobator.com/necropedia/necromancer-weapon-guide/

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Guild Wars 2: "New Build Available, Game Will Restart"

Guild Wars 2 doesn't have weekly downtime as World of Warcraft does.  Instead you will see this message~"New Build Available, Game Will Restart."  A "new build" is an update to the game.

Allegedly you have five minutes to log out (The Solo MMO Player gets kicked out immediately, who at ArenaNet doesn't like him?) and then the launcher will start downloading the new version.  The server has to recognize the new version before you can play again.
http://www.neogaf.com/forum/showthread.php?t=487844

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Guild Wars 2: Classes and Weapons by Role

Here's a chart that spells out how each classes' weapons work with various roles in GW2.  This seems to be based on the beta, by the way.
http://www.guildwars2junkies.com/2012/03/01/weapon-set-themes-by-class-infograph/

Here's the chart alone.
http://www.guildwars2junkies.com/wp-content/uploads/2012/03/GW2-Weapon-Themes-and-Roles.jpg

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