Developers and server administrators can use the Web Platform Installer Beta to more easily discover, download and install the Microsoft Web platform. Using the Web Platform Installer’s simple user interface, you can select specific components or install the entire Microsoft Web Platform onto your computer easily and quickly. To help you stay up-to-date with product releases, the Web Platform Installer tool always contains the most current versions and new additions to the Microsoft Web Platform.
Examples of products which can be downloaded and installed through Web Platform Installer include:
• IIS7 Web Server
• Visual Web Developer 2008 Express Edition
• SQL Server Express Edition
• .NET Framework
• IIS Extensions (such as FTP 7.0 and URL Rewriter)
• …and more
You can download it here.