Free SDK from Microsoft: Facebook C# SDK
The Facebook SDK needed updating for sometime and it is freshly updated as of 7/11/2011. Download and get started creating cool Facebook apps!
If you have questions make sure to go to the http://stackoverflow.com and use the tag ‘facebook-c#-sdk’ for help.
Use this to demonstrate the use of the open source C# language in your class and in the real world!
Use this to build a business around consulting with businesses on how to build facebook presence!