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A good place to start for info would be here:http://www.concrete5.org/documentation/developers/... (under this I would maybe start looking at either "single pages" under the "Pages" section or "Profile" under the "Permissions" section.
Or search the forums.
I have a blog site that I use for traveling and set up the site to allow people to register to the site using only the above mentioned "public profiles" rather than an addon. This works well if you are not charging for membership. This feature creates a single page for that user which allows them to add an avatar and change passwords and if you wish to enable it allows them to message each other.
Let me know if you need further help.