Along with the release of WebMatrix announced here..
A slew of dependencies were released as well. If you download WebMatrix, it will install these dependencies – also via a new release of the Web platform installer (3.0).
You get IIS 7.5 Express for hosting the Web Matrix projects as well.
And, to top it off – the Microsoft Web Deploy 2.0 tool…
The ASP.NET updates include the Visual Studio 2010 tools updates, adding the MVC3 templates, and, under websites, adding a template for ASP.NET Web Site (Razor)