Guys please don't abuse this feature. Paul, CKO & Doug are trusting you guys to not take advantage of the system. If the system is abused it will undoubtedly revoked. There is already a lot of doubt being cast towards the idea (I think its a really bad idea) and if there is a bunch of people that start changing their names every month and whatnot the feature will be revoked. We are keeping tabs on everyone with a sweet new feature that Paul put into effect.
Also, soon, all members will be able to view all of a member's previous user names in their profile.