Nifty and cool as hell. Sprout (still in beta) offers you a way to build your own Flash applications. Online, for free, without login and in a very basic Photoshop look-a-like UI.
“Sprout is the quick and easy way for anyone to build, publish, and manage widgets, mini-sites, mashups, banners and more. Any size, any number of pages. Include video, audio, images and newsfeeds and choose from dozens of pre-built components and web services.”