Started fooling around with Adobe AIR a bit. Here’s the description of what it is from Adobe: a cross-operating system runtime that allows you to leverage your existing web development skills (Adobe® Flash® CS3 Professional, Adobe® Flexâ„¢, HTML, JavaScript®, Ajax) to build and deploy Rich Internet Applications (RIAs) to the desktop. AIR enables you to work in familiar environments, to leverage the tools and approaches you find most comfortable, and by supporting Flash, Flex, HTML, JavaScript, and Ajax, to build the best possible experience that meets your needs.
To sum it up, it allows web developers to write desktop applications using the skills they already know. So that’s really cool. The AIR Developer Center has a ton of useful info.