Haven't you heard? The Apollo runtime, SDK and documentation is now available on Adobe Labs.
This is a pre-release and as such targeted at developers. What is Apollo? According to Adobe it is 'the code name for a cross-operating system runtime being developed by Adobe that allows developers to leverage their existing web development skills (Flash, Flex, HTML, JavaScript, Ajax) to build and deploy rich Internet applications (RIAs) to the desktop.'
Enjoy.