Easy XP and gold glitch.

[Atselmya]

Simply join a group for a quest and before you turn in the quest have the other group members d/c them self. Next, turn in the quest. Then have one of them log back on and also turn in the quest. Do this for all member's of the group until each person has turned the quest in, you now have gotten 4x the xp and gold you normally would.

Me and my friends boosted each other with this method past nightmare and hell.

[Zakanator]

This is a well known xp exploit with azmodan (before nerf) and zoltun khule being the fastest way do it.