Version 1.0 of the Microsoft Web Platform Installer is out .
The Web Platform Installer (Web PI) is a simple tool that makes it very easy to download and install Microsoft's entire Web Platform in one step, including IIS, Visual Web Developer 2008 Express Edition, SQL Server 2008 Express Edition and the .NET Framework. Using the Web Platform Installer’s user interface, you can choose to install either specific products or the entire Microsoft Web Platform onto your computer. The Web PI also helps keep your products up to date by always offering the latest additions to the Web Platform. Web PI 1.0 supports Windows XP, Windows 2003, Windows Vista and of course Windows 2008.
Also worth noting is the Microsoft Web Applicaton Installer (Web AI) currently in in Beta which allows you to quickly install a set of open source ASP.NET and PHP applications. The tool will check for required pre-requisites as well.