Sites that have really done their homework and figured things out about the wonderful world of Tyria.
Dulfy.net: Dulfy puts out awesome articles and guides for all of the content around Guild Wars 2. Here are the ones I find myself referencing all the time:
- Jumping Puzzles: http://dulfy.net/2012/09/16/gw2-jumping-puzzles-guides-guild-wars-2/
- Missions: http://dulfy.net/category/gw2/guild-missions/
World Bosses: http://gw2.limitlessfx.com/ Tracks which boss is coming up and you can use it to track which ones you have finished for the day.
Ever wonder where to find specific resources? https://gw2efficiency.com/gathering/permanent-nodes Shows where all the farms and permanent nodes reside.