For those of you who don't have Quest Helper, (Like I don't!) these sites are really good, each for different purposes.

1. Wikipedia
2. Allakhazam
3. Wowhead
4. Game Pressure

I used gamepressure for location of mobs, because it has most of them marked on a map.
For a good armour, and items website, then it will be Wowhead, with useful comments.
Allakhazam and Wikipedia are good to, but it depends on your preference!

Lan x