I can't remember when I started using Pipette, an OS X application that tells you what the HEX value is for any color on screen, but it has been very helpful during Web development. I adding the App Update widget to my Dashboard a few weeks ago, and one of the apps that gets "stuck" on figuring out that a current version is installed is Pipette. I went to Version Tracker to see if App Update was just messed up, and started reading the comments when user walfrieda points out Pipette is unnecessary. Mac OS X includes a utility that does more than Pipette called DigitalColor Meter
Sorry Pipette, but your going out with the Trash.