Personally i think code like this is desperately needed. I calls these "User Management Systems" as opposed to "Content Management Systems (CMS)".
For a coder developing a web application, there is an abundance of heavy bloated CMS frameworks, and an almost complete absence of UMS frameworks. And I have found myself choosing a CMS as a starting point just to get the user/group management, when what I would have really preferred is an actively developed and powerful UMS -- without all the crazy content management stuff.
One thing I can't tell from looking through the site is what kind of support for Access Control Lists it has -- this is an important aspect in my view -- a way to assign and manage generic permissions for users and groups.
Meta comment: This is a good example where the thread would be easier for people to find and notice if it wasn't a poll but was titled more directly, like for example "Quadodo and other User Management / Login Frameworks", etc. Please everyone when you post remember that people may be searching for and browsing threads in future weeks, months, years, and you want to make it easy for them to anticipate the contents of a thread when reading it's title.