Sadly, I've noticed a number of quests that QuestHelper doesn't have information on. Still, it's vastly more useful then just going blind most of the time but I frequently find myself going to one of the many WoW fan sites that has quest information for more info on some quests.

I might try one of those leveling guides, as I must admit, the collection quests SUCK when you multi-box. I feel like I'm spending most if not all my time just hunting down for that last stupid Do-Hicky that was part of some rather silly quest but the reward was nice in the end, so I justify it in my brain.

But honestly, I'm questing blind since I've never played that much wow before I started multi-boxing. So I don't know where the optimal quests are. I hate to jump around too much to find the 'right' quests but I'll do it if turns out to be optimal to do so.