Popfly is the fun and easy way to build and share mashups, gadgets, and Web pages. It’s made up of online visual tools for building Web pages and mashups and a social network where you can host, share, rate, comment and even remix creations from other Popfly users.
I thought Pipes was already pretty cool, Popfly seems to take it to another level as you are able to create all kinds of stuff including games. The mashup editor looks good btw, have not tried to build a 'game' yet though. It seems to be really suited towards the non-technical user, i.e. the possibilities are maybe somewhat limited. But who knows you might be able to create a really great game :)
Overview of things that are possible