update: slides posted to Slideshare
So, your client has seen the light and is tossing out their old CMS in favor of Drupal. Their existing content, in the form of square pegs, needs to fit into nice round Drupal objects.
Learn about the Migrate module, from Moshe Weitzman, a maintainer of Migrate and Drush. Migrate module is a native Drupal solution for sucking in content from many different sources and saving it it cleanly into Drupal.
Folks who need data moved into Drupal, or developers who are tasked with this challenge.
Questions answered by this session
How can I move my site to Drupal
How can I robustly migrate data into Drupal
How do I build an application on top of Drush