Better late as never, so here are the slides from the rules presentation at the drupalcon. I'm also attaching the two features which were built with rules during the presention:
* React on user inactivity
* A basic workflow
The features can be activated like any regular drupal module.. :)
There is also a video, you can find it here:
http://www.archive.org/details/RulesHowtoleveragerule-basedautomationonyoursites