I thought it would be great to have a page that lists all sorts of authorization systems in one place.
I guess that stackoverflow.com would prefer if we used their documentation portal, but I'm not familiar with it at all.
As a developer I always wanted to know the various ways you can implement authorization. Everyone is familiar with the role-based approach, but let us not get into that solution, as it's the most basic form. A lot of times clients are interested in very complicated authorization solutions.
I presume ACL is the way to go, but maybe there are other [standardized] systems? I think that even ACL can be implemented in various ways too.
So, guys, lets write some of the solutions here. All answers and links to articles are welcome.