Disktivity is the LED that's missing from your Mac. Disktivity provides you with an unobtrusive activity monitor that displays the current status of your hard drive.
Disktivity runs quietly in your status bar and can be set to start automatically when you log into your mac. Included is an easily accessible legend that describes what each color of the LED means so that you are always aware of what your Hard Drive is up to.
With the click of a button, you can add an HD tag to multiple video files.
The HD tag, if set, is read by iTunes and will place a little HD icon next to your video file to indicate that the resolution is HD.
There are other apps out there that allow you to tag your videos with the HD tag but none so far that I've found that allow you to tag multiple files at once.