Microsoft Popfly is the fun, easy way to build and share mashups, gadgets, Web pages, and applications.
Popfly is available as an open beta consisting of PopFly Creator, a set of online, code-free tools for building web mashups using "blocks," and Popfly Space, a community site for sharing mashups. Microsoft also provides a Visual Studio Express add-in for Popfly, which lets users distribute VSExpress-built web apps on Popfly Space. Detailed instruction on getting Popfly account are here.
Popfly Explorer lets you add Silverlight gadgets to Web Pages
Popfly Explorer is a Visual Studio extension that enables you to create, save and share Visual Studio applications on the Popfly web site. This provides Web developers and Popfly users an easy way to add Silverlight gadgets built in Popfly to their Web pages, as well as publish HTML Web pages directly to Popfly. Learn about the Popfly explorer here.
Want to know more about how to use the Facebook block and other Facebook-related features in Popfly? Check out some video tutorials we put together. The three part series is here.