On the heels of the Wizard god mode exploit, here's reportedly another god-like mode. This one is for the Diablo III's Barbarian class.
According to the Blizzard forums, the exploit doesn't technically make you invincible, but it does allow you to get 8 percent of your HP back with every hit. Here are the steps, courtesy of YouTube user MetaSerge (there are steps on Blizzard's forums, too):
1. Have Furious Charge with Dreadnought Rune
2. Charge into opening cinematic (before it begins)
And that reportedly starts the exploit. The effect apparently lasts until you die or until you use Furious Charge again.
Some players are able to get the exploit working. Others were not. Give it a whirl and judge for yourself.
BARB GOD-LIKE EXPLOIT [Battle.net Thanks, Stephen!]