Reducing Duplicate Content with ASP.NET MVC

As you're all no doubt aware, ASP.NET MVC recently went RTM. This brings the MVC-style of coding, made very popular by Ruby-on-Rails to the ASP.NET world. I've been eager to start using MVC for months, but I've been holding off until I knew the API was locked down so I don't have to change anything. Unfortunately, like WebForms, MVC has some "issues" with regards to duplicate content, making it not all that SEO-friendly.