When I first saw this demoed a few months ago the Microsoftie who showed it to me literally built TwitterVision in two minutes right in front of me without writing code. TwitterVision’s inventor told me he took four hours to do the same thing. Lets someone who isn’t a coder (like me) mashup various Web services easily and quickly.
Find out more here:
My favorite bit from the FAQ page:
Q: Why did you call it Popfly?
A: Well, left to our own devices we would have called "Microsoft Visual Mashup Creator Express, May 2007 Community Tech Preview Internet Edition," but instead we asked some folks for help and they suggested some cool names and we all liked Popfly.