Twice in two days I was asked the same question so here’s my answer:

I’m starting with the pre-requisite that your team has advanced knowledge of ASP.NET development.

1. Introduction to SharePoint Server 2007
2. For Developer who works with Office SharePoint Server 2007 to build Web portals and integrate business applications: MCTS: Microsoft Office SharePoint Server 2007 – Application Development, Exam 70-542
3. IT professional who configures and deploys Office SharePoint Server 2007. MCTS: Microsoft Office SharePoint Server 2007 – Configuration. Exam 70-630
4. Implementing a standard content managed website using SharePoint 2007