There are numerous posts on doing File uploads with MVC, the most commmon link being to Scott Hanselman's blog which is certainly a good read. However in this article there is mention:
This post is out of date. It talks about an earlier version of the MVC Framework. Please check the ASP.NET MVC documentation for how to do file uploads.
However no link to the "MVC Documentation for how to do file uploads" is provided.
What changes have been made with MVC for version 2 and file updloads. (Link back to documenation greatly appreciated)