Unfortunately, on August 24, 2009 the Popfly service will be discontinued and all sites, references, and resources will be taken down. At that time, your access to your Popfly account, including any games and mashups that you have created, will be discontinued. However, Microsoft is still very much dedicated to helping you express your creativity and pursuing a path to software development and offers multiple products to help along the way. http://popflyteam.spaces.live.com/blog/cns!51018025071FD37F!336.entry http://shankarsoma.wordpress.com/2009/07/17/microsoft-popfly-gets-squashed/
Guess it didn't make sense to keep up with this as they have a number of other builders they are pushing XNA etc