I need to post this because I've gotten this question in email a few times. The information here was gathered from the MSDN Product Comparison page located here.
Here's a table which should help identify which Expression products are available for each MSDN subscription level. If you want to change your MSDN subscription level or have other questions about your MSDN account you can contact MSDN customer service at 1-800-759-5474.
Expression Product(s) Available