Microsoft SharePoint 2010 Developer Reference (repost)

Sharpen your SharePoint development skills with this complete and concrete guide to Microsoft SharePoint Foundation 2010 and Microsoft SharePoint Server 2010. This book shows you how to develop real-world solutions with techniques for extending and customizing the SharePoint environment with Microsoft Visual Studio® 2010. You'll find numerous examples, mostly in C#, that exemplify best practices for SharePoint development.

Major topics include:
Extending SharePoint 2010
Developing workflows for SharePoint 2010
Advanced Web Part development
Security infrastructure
SharePoint Object Model programming
You'll also learn how to work with Microsoft Silverlight® Web Parts, claims-based authentication, Business Connectivity Services, and more. It's the pragmatic, everyday reference that every SharePoint developer needs.