Here I would like to introduce a nice talk held by Google Tech Talks on 8 OCT 2007, talking about "Implementing Drupal".

I found it' s really nice, detailed and I think you will be interested if you wanna have a more thorough understanding on Drupal.

Here is the link: Link

It's a about 52mins-long youtube video. You may also drag the time line to wherever you like according to following parts of the talk:

11:00 Killer Modules
1800 Drupal 6 intro
2030 Drupal 7 intro
2159 Links Resouces
2500 Drupal example - Edutopia.org
4600 Drupal vs Joomla

The part for "Drupal vs Joomla" is recommended, no matter you are a Drupal fans or Joomla fans, I've been waiting for such an objective view on these two great cms.

Enjoy!
Enjoy Drupal! :)