Download Sharepoint 2010 VPC Image would be available soon. If you are one who can't wait till that than you should download Sharepoint 2010 Technical Documentation.
- how to Customizing the Ribbon in Windows SharePoint Services "14". The Ribbon is now included in the user interface for Windows SharePoint Services “14” and Microsoft SharePoint Server 2010.
- Customizations to the Ribbon in the included example are created using the Feature infrastructure, and can be deployed using a solution package (.wsp file). This tutorial for sharepoint 2010 is provided in both PDF and XPS format.
- This compiled help (.chm) file contains reference topics focusing on types and members that are called by other Microsoft applications. This reference does not reflect the entirety of the SharePoint Products and Technologies 2010 managed object model.
- The full SharePoint Products and Technologies 2010 SDK will accompany the public release of SharePoint 2010.
- Download Sharepoint 2010 Technical Documentation