The site may experience some downtime. Try again later. It worked when I posted the link. Someone on the forum of my previous Web host posted that. I personally visit another site:
http://php.resourceindex.com/Complet...er_Management/
There are many more such script collection sites on the Web, or just by plain searching. The Google directory/Yahoo has a list of all these. Go and find some to start your research.
Personally, I don't expect I will find a dedicated book on designing login management Web applications. Even if you find one, it may not suit exactly your requirements. So I'd rather get the concepts and the available technologies understood first, then start out designing my own scheme of doing it with those technologies, regardless of what those books say. Most of the time, I will find my own "discoveries" reappear in books I subsequently read, but in less detail. I'm convinced that a cookbook approach won't make you a good developer.
As for books, I don't really know much PHP books as I am not that immersed in PHP compared with that of Perl. Maybe you will find some more ideas on books and advice on those one of many Web development-centric forums rather than this forum, which is instead centered around Unix and system administration. I can tell you the principles, but unfortunately I can't give you much code than stray advice.