Popfly is an online system for creating mash-ups, widgets and live Web pages without writing code -- you just link little boxes together. It created a bit of a stir back in May, when I blogged about the invitation-only alpha verson. Now it's in public beta you can use it by entering the Windows Live ID (or MSN or Hotmail or Passport ID) that you already have.
One of the new features is Facebook integration: you can publish Popfly applications directly to Facebook.
Microsoft is announcing this at the O'Reilly Web 2.0 Summit (see Bobbie's report, above) so presumably there will be a press release online soonish. O'Reilly has a Popfly page at http://www.popfly.ms/users/Team/web2summit.content and yes, it's all based on Silverlight.
Note the cute use of the Montserrat country domain.
Update: I've now found the press release: Microsoft CEO Steve Ballmer to Address Web 2.0 and the Future of the Internet
