SLO: Site Login Objects
This is yet another site/session login system with a big difference - it works with Amazon Web Services SimpleDB. (It uses the pawsSDB library to interface to SimpleDB.) While there are a several other login framework examples available, this one is object-oriented, and based on SimpleDB.
Because it is object-oriented, it is really easy to modify and tweak. If you need to build your own login based web site, and you can't or don't want to use something like Drupal or other CMS package, then this can really get you started -- not to mention that it is SimpleDB based.
This version can use PHP
$_SESSION variables, or encrypted cookies to save state from one page to the next. The cookie version should work when used with multiple servers such as EC2.
A functioning demo is available here. You can create a user login account, but the accounts will be purged on a regular basis.