pegboard is a social bookmarking service that lets you save, search, share and tag your bookmarks with people all over the world!
Technogeeks with a nice solution to having one CakePHP application authenticate a user (and thus accessing data) from a different CakePHP application.
An openID (and others) single sign-on service from Jan Rain.
Read/Write Web gives a nice run-down on OAuth.
An open protocol to allow secure API authentication in a simple and standard method from desktop and web applications.
RosSoft adds in cookie management that should be available in core
A cakePHP component for doing authentication of users
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