Checked out your guide, I like the tooltip popups. The MB notes and "grade" as you put it are a nice but I agree that not too dual-boxers will be able to mouse over each quest to see if it the grade or MB notes.

Just curious did you scrape wowhead for the tooltip info? The quest chain and xp is left in the chain are a nice touch but how accurate are they? Wowhead still has some issues with broken quest chains.