OAT's versatility
If you haven't done already, visit the OAT Gallery - an OAT-based personal photogallery solution. I created this in my free time with goals different from any other OAT-based projects: no database, php-based, non-standard original layout & look. My sample installation is here.

As one can see, only few parts of OAT are actually used: only the OAT.AJAX library and Timeline widget. This is a nice demonstration of how multi-purpose and versatile OAT is.