I was told this by a friend that was in CB and EA and have not actually used it myself, so I can't confirm its accuracy.
The /instanceselect command allows you to switch instances in-game to group with friends, avoid people, whatever. However, it's instant cast with no restrictions, so you can use it when you're about to die to mobs, or get ganked in PvP. Apparently it also teleports you to your 'hearth' location.
Try it out, if it works, it can be pretty handy.