Microsoft Popfly - Build and share mashups, gadgets, games, Web pages, and applications
Microsoft Popfly (internally codenamed Springfield) is a website that allows users to create web pages, program snippets, and mashups using the Microsoft Silverlight rich internet applications runtime and the set of online tools provided. Popfly is currently in Beta stage of development. It requires users to log in with their Windows Live ID, and provide additional information about themselves when logging in for the first time to use Popfly.
Create Games. Popfly is a simple way to create and share games with your friends. Choose from a variety of built-in templates or start from scratch to create a side scrolling game, a 2D shoot-em-up, or a host of others. And best of all, you can get started without writing a line of code.
Build Mashups. Mashups are a kind of application that take information from many places and mix it together. With Popfly’s mashup creator you’ll be able to take photos, RSS feeds, and many other kinds of information and combine them to create your own personalized view of the web.
Design a Web Page. Always wanted to create a web page but thought it was too hard? Popfly makes it easy with its simple web page creator.
…and Much More. Popfly makes it easy to place your creations into your blog, your Facebook page, or even make them into Windows Vista sidebar gadgets. And it’s fully integrated with Visual Studio™ so as you gain experience you can upgrade to professional-quality tools.
More Info: http://www.popfly.com/
Popfly has been around for quite some time, it was recently out in beta or something, but has been there for some time now. I had tried and it did seem pretty cool.