The migrate module provides a flexible framework for migrating content into Drupal from other sources (e.g., when converting a web site from another CMS to Drupal). Out-of-the-box, support for creating core Drupal objects such as nodes, users, files, terms, and comments are included - it can easily be extended for migrating other kinds of content. The power comes from an object oriented API that's tricky to get started with - We'll walk through the various classes in the module and how they work together to manage migrations.
While I will most likely focus on migrations from databases, we can touch on migrations from CSV, XML, various other source files (and others are welcome to join and co-present their own examples). If someone wants to go over feeds and other approaches, perhaps we can get a 2 hour room and make a long BOF out of this.