Even without MCMS SP2 being available you can already evaluate ASP.NET 2.0 with MCMS!
You cannot use it on a read-write website as webauthor does not yet work with ASP.NET 2.0 but you can configure a website that is configured with ASP.NET 2.0 as MCMS read-only website.
So for authoring you need to have a normal ASP.NET 1.0 or 1.1 web site with a template project created with VS.NET 2002 or VS.NET 2003.
To get this working you need to follow the steps below:
Important: You should not yet use ASP.NET 2.0 on a production site! ASP.NET 2.0 is not supported by Microsoft without MCMS SP2 installed. The steps above should only be used to evaluate the benefits of ASP.NET 2.0 for a MCMS site now. There is also no guarantee that code developed now for a site as configured above will run without changes after SP2 has been installed!