Migrating a Drupal 5 site to a Drupal 7 site.
I had to accomplish the task of migrating the content from a Drupal 5 site with 10,000+ nodes to a new Drupal 7 version. The caveat was that all of the node information needed to remain intact due to various links that were entered into the body of posts. My initial thought was to use a .csv file and import directly into the database. After some more research I discovered the migrate and migrate_d2d modules.