Although this has been covered in other forum posts, we now have the ability to register your nickname. This will prevent anybody from using it when they are not logged in under your account. This is the only way to protect your name on this site, and at the moment that's all user registration is used for, though in the future there may be some exciting new features which will only be able to be tied to an actual login account. We've got some great stuff in the pipeline, so stay tuned