Okie, this is an easy one and I see people doing this all the time. I don't be leave anyone has posted it as of yet.
How this works is say you have been off fighting jumpers. But to your dismay three more have spawned on top of you. Now of course death is looming over your head. There is on way you can take four on at once. What do you do?
Well if you know this exploit you run. If you can go for a full 20 seconds with out taking damage the game will no longer consider you to be in battle. At this point all you have to do (while running) is press <alt-x>, click on restart and then confirm that you would like to. Since you are on longer in combat you will jump back to the toon select window. At this point you can just wait a little and log back in once the mobs that where chasing you are gone and your free to go about playing, without taking a death.
But if you try to do this to soon the game will respond with something along the lines of "Your are in battle" and you will need to keep running until you make it a full 20 seconds.
This has saved my life more times then I care to think about. Enjoy
