Migrating data into Drupal with the Migrate and Table Wizard modules

What's the best way to move external data into Drupal? How do you do that big migration project you just landed? Need to integrate a non-Drupal database into Views? Meet two of the coolest modules to appear on the scene in the last year, and get some ideas about how you can finally drop that Wordpress or Joomla! site you've been meaning to move to Drupal.