This exploit coincides with the original post by Marzz.
http://www.mmowned.com/forums/wow-ex...-exp-free.html
Anyways, read that guide, and I am going to tell you how to do this with one person. I mean that the original guide requires 2 people if you don't double log, which some computers can't do. Anyways, log onto the trial account and go to the area of where the quest is for your main.
Next, make a macro saying /sit /stand /sit /stand /sit /stand all the way to the bottom. Separate each /sit and /stand by hitting the enter key.
Then click your macro over and over again until you disconnect.
Finally, log into you're main and turn in the quest, you're trial account character should still be in the area of the quest. Turn in the quest and you get 3x the experience.
Okay, now I don't know if you have to be in a group for this, so if you do, you would have to double log for a few seconds to send and accept a group invite.