Microsoft WebMatrix brings together a bunch of resources into a simple install - IIS Developer Express, SQL Server Compact, and ASP.NET. And, with Web Application Gallery you can install & customise popular ASP.NET and PHP open source community apps, whilst also seamlessly integrating with professional development tools and servers including Visual Studio, SQL Server and Windows Server.
"WAG contains a long list of free downloads to install on top of WebMatrix, including Moodle, Joomla!, WordPress and a long list of other free apps to install (the main categories are: Blogs, CMS, eCommerce, Forums, Galleries, Tools and Wikis). It also includes a new, easier-to-learn syntax for ASP.NET to provide you with a faster way to build standards-based Web sites. The built-in helpers simplify the use of ASP.NET to perform increasingly complex and common tasks like connecting to a database, displaying a Twitter feed, or embedding a video."
More Info: Web App Gallery