In the latest post in his blog – SharePoint Joel – Joel talks about the various migration tools, including Tzunami Deployer for SharePoint 2010.
His post also includes a list of ECM systems, and which vendors provide a migration path for them.

Best SharePoint Migrator: Start Your Migration to SharePoint
What is a SharePoint Migrator? When organizations decide to upgrade their content management systems or consolidate data, they often choose Microsoft SharePoint due to its