xPDO is in beta and we're changing focus to improve documentation and usability. xPDO is being used to develop MODx Revolution 2.0, a next generation PHP-based, Open-Source content management framework.
I'd like to extend a special thanks to Andrea Giammarchi for his PDO for PHP 4 implementation that inspired me to begin coding this project. If not for PHPClasses.org and the inspiration I found in Andrea's work there, the OpenExpedio project would likely not exist, as I probably would have invested my time in working with PHPDoctrine.
This is the initial documentation for XPDO, updated as I get a chance. If you are interested in contributing to the OpenExpedio project documentation, please contact us.
For developers, check out the API documentation, which I generally keep up to date with the code in the trunk.