[This documentation is preliminary and is subject to change.]
Microsoft SharePoint Foundation 2010 includes many new features, feature enhancements, and general improvements to feature behaviors. Most of these are discussed in the Microsoft SharePoint Foundation 2010 Software Development Kit (SDK).
Each of these topics provides a brief description of the important new features in SharePoint Foundation as well as areas where existing features have been improved and enhanced. Each topic includes links to areas in the SDK where the subject is discussed in more depth.
Getting Started with Development for SharePoint Foundation