The other day, I wanted to find out the web safe color of a particular item on the screen of my Mac for a web design project I was working on. My first step was to go searching the Internet for such a tool (preferably free). Then, in the midst of said search, I was reminded that this little tool was not only already on my Mac, did exactly what I wanted, but also did it better than any of the tools I was able to find.
To take your Digital Color Metering to the next level, you can drag the color off of the well on the right (next to the R G B labels) into any standard color picker to bring it over. Sometimes, you can even drop it straight into an object in another app!
Give it a try: sample a color, press cmd-shift-h to hold it, then drag and drop from the swatch an object in Pages or Keynote.
Edited: The shortcut to hold is command-shift-h, not command-h. Oops.
