C# 9.0の話題も出てきたね。
http://www.panopticoncentral.net/archive/2007/05/11/20566.aspx
http://blogs.msdn.com/sreekarc/archive/2007/04/03/immutable-the-new-anonymous-type.aspx
http://blogs.msdn.com/wesdyer/archive/2007/02/11/baby-names-nameless-keys-and-mumbling.aspx