Hans Lellelid gave a presentation on Propel, an ORM tool for PHP applications. He began with an overview of Propel and a typical workflow using it, which involves designing a database schema in XML, configuring the code generator, building SQL and PHP classes, and then using the generated objects in an application. He then went into more depth on specific Propel features like selecting and relating database rows, customizing the code generation, and future plans for Propel 2.0.