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.
This will be great for people who want to add a little jazz to their website, Facebook page, etc, but don’t have a programming background. With more of a drag and drop style, people can quickly create applications by pulling "blocks" from other sites and linking those blocks together.
You can read a review and perspective on this interesting new app at Ed Dunhill’s Blog.