I remember attempting to use an extension-less URL format in a CMS I wrote way back when .NET 2.0 first came out. The problem was deploying to an IIS6 server. It made it practically impossible. I had to programmatically create folders for the path (tons of folders) and insert a dummy "Default.aspx" in there to get the request routed to ASP.NET. Of course, I hated that "solution" and had to abandon using extension-less URLs.
Now that I am getting started with ASP.NET MVC, I again want (need) to use extension-less URLs. Can somebody tell me if I am going to have the same headaches when I try to deploy my app to IIS6? Is anything special required to get this type of URL structure to work in IIS6?