Posted Jun 21, 2011 13:27 UTC (Tue) by lambda (subscriber, #40735)
[Link]
It runs outside the browser, and can do things like access your local filesystem.
That's pretty much it. The only time in recent memory that I've seen it in the wild is in Amazon's Cloud Drive MP3 Uploader, which requires Adobe AIR so it can grovel through your disk to find MP3s (or other music files) to upload to their "cloud." I declined to install Adobe AIR just to try out Amazon's cloud music thingy.