>>http://msdn.microsoft.com/subscriptions/default.asp
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>I'm wondering why Visio Profesional and Office XP Developer Edition aren't included with MSDN Professional?

Those are considered applications, not as much developer tools, plus it is a pricing issue. The price of MSDN Pro is very inexpensive for what you get and if OfficeXP/Visio was included, the price would be much more. MSDN Enterprise and MSDN Universal are the next step up and both include OfficeXP/Visio, as well as SQLServer.