When looking through my quest page to find the side quest I want to work on, or even refind the quest I am working on when I accept a side quest I don't want to do right then it is extremely difficult to locate the quest. I accept all quests, and then go back and work on them at my convenience, so I typically have ten pages or more of available quests.
What I suggest is grouping them under location, quests received in Wizard City go under a Wizard city tab, etc. The names of the worlds would be in a list and when you clicked on them, it would open that worlds available quests in your spell book.
On a side note- I love the quest arrow and the over head maps. If not for these I would never have continued playing the game. I have tried other, similarish, games without these and lost interest quickly. Thanks for this great feature.