Although it is not required, I have made it to where people can create profiles for making comments on my blog of AllenDavisBlog.com. You can either sign the comments "secretly" where I would have no way of knowing who the commenter is unless you display your name, email address or some other information. Or you can have a profile that you can sign into where it automatically tells who you are. It is totally up to you. You can use the same log in to leave comments on a lot of other blogs that use TypePad. I am just giving you the option to be able to create a simple profile by going to:
http://www.typepad.com/profiles