Macromedia Flex
Macromedia has released Macromedia Flex ( currently in Beta ).
It comes with his own devnet and of course, with a blog.
Macromedia says:
Flex consists of a presentation server installed on top of a J2EE application server or servlet container, a rich library of user interface components, an XML-based markup language used to declaratively lay out these components, and an object-oriented programming language to handle the user interactions with the application. The end result is a Rich Internet Application (RIA) rendered using Flash Player and developed using industry standards and a development paradigm familiar to developers.