Sharepoint Content Type Hubs

Content Type Hub FAQ and Limitations
http://blogs.msdn.com/b/chaks/archive/2011/02/09/content-type-hub-limitations.aspx


Content Type Hub – Publishing and Subscribing to Content Types Programmatically (C# Code)
http://blogs.msdn.com/b/chaks/archive/2011/09/04/content-type-hub-publishing-and-subscribing-to-content-types-programmatically-c-code.aspx