I'm sorry, but I despise this idea of changing names. Sure, I regret my name, and more so down the track because I chose it from what bullies used to call me, but honestly let's look at the pros and cons of this.
1. You can have a cool new username.
1. Server Owners can't ban you if you change your name.
2. It is morally confusing for people to distinguish you.
3. It's going to cause many problems down the track, whether system overloads at Mojang, or debates of innapropriateness.
This is why I don't condone this new idea Jeb brought to mind, it's just plain horrible and will lead to a new level of griefing.
There could be a different display name and username?
Either way I think this is one of the best things to happen to minecraft :D. I hate my username
This would be a great thing for griefers. Just sign out, change your name, sign back in. Simple.
That aside, I don't really think you should be able to change your username. You should have taken the time to think about what you wanted and/or make alternates should a name get taken. Those of us who took the time to really define ourselves will be forced to follow along and those guys we knew as Sinistar404 or PokeJack can easily disappear and we will never find them again. We would have to remember a new name just common enough to give most of us headaches.
Think I can always get Jetra? Well, I have several others that I have to use sometimes.
This is not a very practical idea.
If someone gets banned, they can just change their name. If you change it for fun, all the servers you were whitelisted in, you wouldn't be allowed in, until they whitelist your new name.
I like the idea of a unique ID number, that never changes. So you can change your name, but not change identity. This could also play a part in anti-grief protection, as their ID would be banned too.I think they should be more clear on minecraft.net when making an account, that it is going to be your screen name too.
Although I love my username as it is
This is great news! When I created my username, I wasn't sure of what minecraft was, and was just using my "throwaway" screen name for game accounts I'll never use. Realized soon that I love minecraft. Even if they charge a small fee to change it, I'd pay.
And I don't even know why we need this crap, it's all useless if all of these people weren't kids This wouldn't be a problem because all the kids here want the "COOL" Name so yeah It's pretty much a waste of jebs time except if he makes it cost like 5$ Or euros a name he'd probably make lots of money.
Jeb mentioned in his question and answer session that the name changes would be a one-time only thing. We run the same feature on a site I run, and it's worked out great. We allow one name change per year, if you want it.