NCsoft released Guild Wars Eye of the North Developer Diary second part which talks about quest system in Guild Wars.

Eye of the North Developer Diary #2
What is Your Quest?
By Ben Miller

In designing Eye of the North, our first true expansion for the Guild Wars online RPG, we wanted to improve on what worked well in the past, throw out those quest types that gamers routinely hate, design new quests and new quest types that players had never seen before, and give people more options so they could play the game in many different ways, instead of forcing all players down the same path. In short, when it came to quests, we wanted, in the immortal words of Graham Chapman, "to seek the holy grail."

Going into GW:EN we knew we were creating an expansion geared for max level characters, which meant we could design a game with no newbie area and avoid having to teach new players how to play the game. This gave us the opportunity to create quests that really push the envelope. With this in mind, we committed all of our questing resources to making sure that each and every quest provided players with something insanely cool, or new, or different, or, better yet, all three.