I have been showing off Popfly as a great example of a Silverlight 1.0 application but my colleague David Chou has gone even deeper with this post about Popfly as a Platform:

Popfly provides an environment where people without a significant technical background can build stuff in, and hides the complexities in the underlying infrastructure. It also articulates many of the Web 2.0 principles, such as enabling participation and harnessing collective intelligence, leveraging the long tail, lightweight development models, rich user experiences, etc. David Chou provides a perspective on how Popfly can be leveraged as a next-generation platform in the Web 2.0 world.