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 Drupal nodes, users, and comments is included - hooks permit migration of other types of content.
In addition to performing the creation of Drupal objects from arbitrary data, migrate helps with the methodology of data migration:
Agaric makes powerful web sites for people who do things. As a collective of skilled workers, Agaric collaborates with you and open source free software communities to develop tools and build platforms that meet your needs.
How we can help you? Please ask Agaric!