Microsoft just released an Alpha version of Popfly. Popfly is a tool for creating Mashups, just like Yahoo Pipes

Popfly is a free, easy to use tool, to build and share mashups, gadgets, Web pages, and applications

The greatest part of all, is that it’s using Silverlight, this means that it is also cross-platform

Check out also what others have to say about Popfly:

• McNamee
• TechCrunch
• Don Dodge
• Ryan Stewart,
• Robert Scoble
• Mary Jo Foley

If you want to know more?

• Watch the Popfly screencast
• Popfly Overview
•  Try it out (it is now an invitation only, but you can sign up for the next round of invites.
• How it started