Cenarion Moondust is used only for a quest. If you die fighting Lunaclaw, you will need to travel back to Darnassus or Thunder Bluff for more in order to attempt the quest again. Once the quest is complete, there is no way to obtain Cenarion Moondust.
World of Warcraft,
As far as I know there is no such thing as moon dust in World of Warcraft.
World of Warcraft
If you want to have more fun than you already do then, yes!
A lot more people play World of Warcraft than Runescape. It is a more populated website.
world of War Craft
The American film production company Legendary Pictures is behind the movie World of Warcraft. The movie will be directed by Duncan Jones and will be released in 2015.
The obvious answer is World Of Warcraft as it is more popular and better then warhammer. it has over 12 million players
I don't play both of them but World of warcraft is. Because if you seen the commercials for wow it's going to have more players.
runescape
The Guardians of Hyjal are a new faction that will be appearing in World of Warcraft: Cataclysm. See the related link for more detail.
No, you can not have more than one battlenet account on one licence of World of Warcraft. You can however, have more than one licence of World of Warcraft on each battlenet account.