I really like this blog entry on the you had me at EHLO which was posted a little while ago, which explains the reasoning and the motivation and thought process behind the complete rewrite of the Exchange 2007 Management Console. It is quite an interesting read and reveals the major depth of work and consideration that has gone into the new console which I think works so much better. It is logically so much easier to work with and breaks down the function and task without taking you down 10 levels and 48 tabs before you find what you want.