[YouTube link]

You're going to need a Nexus One (or some other phone with a trackball capable of lighting up in different colors) to take advantage of this feature in Android 2.2, but color trackball notifications are officially here. OK, actually they've been available for some time in custom ROMs (and as you'll note in the video above, I'm cheating and using CyanogenMod for demonstration purposes). But now they're bona fide in Froyo, and we're already starting to see them in more applications.