Good news from Microsoft! According to Somasegar's blog, Expression Web is now available through MSDN and Expression Blend will be available through MSDN once it has been released. Expression Design and Media will not be available through MSDN, but those tools aren't intended for developers, so there isn't as much of an expectation to have them as Web and Blend.

Expression Web is Microsofts replacement for FrontPage. Expression Blend is a new tool for designing desktop applications using XAML.