More links (early views of upcoming things)
Brian Keller explains how to integrate TFS with SharePoint Services 3.0 here. It's a pre-release integration, but it gives you a way to use some of the more recent SharePoint capabilities with your Team Project Portal.
Matt Mitrik posted a link to the migration toolkit spec in this blog entry: Toolkit Spec Published. The link to the toolkit spec itself is here (XPS format). It's designed to insulate migration tool writers from the full Team System API, support migrating or synchronizing versioned items from other systems to TFS, and support migrating or synchronizing work items from other systems to TFS.