http://blogs.technet.com/jasbro/archive/2007/08/22/quickie-blog-post-sharepoint-sdk-available-quick-note-on-discusson-lists.aspxThe Sharepoint SDK (officially, the "SharePoint Server 2007 SDK: Software Development Kit and Enterprise Content Management Starter Kit") is downloadable from microsoft.com . If you develop .NET applications for SharePoint, or support said applications,en-USCommunityServer 2.1 SP1 (Build: 61025.2)