Adobe AIR
From Wikicliki
According to the Adobe AIR website, Adobe AIR "is a cross-operating system runtime that lets developers combine HTML, Ajax, Adobe Flash®, and Flex technologies to deploy rich Internet applications (RIAs) on the desktop. Adobe AIR allows developers to use familiar tools such as Adobe Dreamweaver® CS3, Flex® Builder™ 3, Flash CS3 Professional, or any text editor to build their applications and easily deliver a single application installer that works across operating systems."
Basically it means it allows you to view fancy Flash and AJAX from your desktop, across different platforms.