How do I use two models on a shared layout page in MVC 3 ASP.NET?

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I have a main layout page that has a basic table setup. I have a Main Content cell that I use to put RenderBody() in. I have product listings that use a Products database and I have a menu on the right side that needs to access the User database. How can I list my products using the products model in the Main Content cell and use the users model to list info in my Menu cell?