To answer some of the questions that have come up:
1) You can copy characters to testbed as many times as you like. If you already have a character with the same name you will be given the opportunity to rename your character as part of the copy.
2) The restriction on how many nations you can play on a normal server is being enforced by the copy service. This is a bug in the copy service.
3) The character copy service won't let you switch nations. Switching nations would need to be a hugely complex operation to avoid breaking all kinds of faction and mission tags.
4) All auction listings are being expired on the source server. That's also a bug in the copy service. They're supposed to be expired after the copy on the destination, but the source character on a copy isn't supposed to change.
5) For various boring technical reasons we aren't going to be able to offer character copies to testbed 100% of the time. They are going to come and go over the next few months (until we have a chance to fix the stuff that's keeping us from offering them all the time.) This time around the ability to copy will probably only be available for a few days. Regardless of whether the copy SERVICE is available, any characters copied to testbed before it goes offline will still be available to play on testbed.
Joe