If you weren't able to make it to the last webcast from php|architect (as a part of the TEKX webcast series), they've added the download of Matt Butcher's talk "A Developer's Introduction to Drupal".

The first episode of the webcast series is also available - a talk Jonathan Wage gave about Doctrine 2.

There's also plenty of time to register for some of the other upcoming webcasts covering topics like MongoDB, Wordpress caching, working with remote developers and Facebook's HipHop tool. The webcasts are free to attend, to there's really not a reason you shouldn't head over and register right now!