http://massively.joystiq.com/2012/02/21/queue-no-more-thanks-to-guild-wars-2s-overflow-servers/
"Picture this: You've just come home from a hard day of work and you want to relax by gaming and perhaps responsibly enjoying a delicious beverage. But wait -- there's a queue for your server! What are you going to do? You could reroll and get into the game faster, but then you can't play with your friends on your precious main character. You can also sit it out and just twiddle your thumbs for a bit, but otherwise there's not a lot to be done. Or at least, there wasn't until Guild Wars 2 got into the picture.
Martin Kerstein, ArenaNet's community team lead, stopped by the Guild Wars 2 Guru forums to give players a peek at the title's server overflow feature. With this feature, the above scenario plays out a bit differently. When there's too much traffic on one server, your character will be temporarily sent to a different server. Once you've reached the front of the queue, you'll be asked if you want to transfer back to your original server, and voila: home, sweet home. Any progress made on the overflow server will be carried back to the home server, so you can even be productive while you're waiting in a queue. How's that for efficiency?"
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Awesome feature! Makes you wonder why it hasn't been done before. 
