I did a search and did find one topic on this, however, it was in the General topic with only 2 responses, so I'll put it here as well.
http://www.mmowned.com/forums/wow-ge...alls-fire.html
Go to Isle of Quel'danas and pick up the quest called "Keeping the Enemy at Bay" from Vindicator Kaalan and obtain your burning oil. Now you can just bind it and shoot fireballs anywhere and everywhere, as a pretty big range.
Enjoy, it can cause a lot of lag if you macro it with a G15 keyboard or if a lot of people are doing it in major cities like they are on my server.