Whats the main difference between VB.Net Standard and Proffesional?

I know proffesional has server explorer and remote debugging etc, I have been to http://msdn.microsoft.com/vbasic/howtobuy/choosing.asp but I get the feeling there should be a major degree of functionality in proffesional thats not in standard and I cant see it... What is it huh?

Your help appreciated.