Popfly Game creator (make your own game!)

The Popfly team have launched a new site where (if you have Silverlight installed) you can create your own game with the aptly named Popfly Game Creator. Using simple tools you can create a browser based game from a set of pre-defined templates. If you can drag yourself away from Iron Man or GTA, why not try to create your own fun?

Note: The tool is in an Alpha state, so YMMV.