I gave a presentation at last night's LA Drupal meetup on migrating from Squarespace to Drupal. I'm writing a full blog post (maybe more than one) on the subject, but for now I want to post the slides.

Download Squarespace to Drupal: a migration adventure (PDF)

All the links in the PDF should be hyperlinked and clickable. There are also some XPath selectors and drush commands that might be useful. The full post on this topic is coming soon.