There seems to be a fair bit of activity in the Sharepoint space at the moment. Great post over at MSDN on getting started with tools and techniques for working SharePoint Services 3.0:
Summary: Learn the skills you need to develop for Windows SharePoint Services 3.0, about the differences from traditional ASP.NET development, about the required development environment, and the steps to build a Windows SharePoint Services solution with Visual Studio 2005 Extensions for Windows SharePoint Services 3.0.