One of the most genuinely useful applications of OS X’s native PDF-based transparency engine that I’ve encountered: iconfactory’s xScope — a set of tools for designers and web developers that rides on top of your open apps and lets you instantly see what viewport would remain if you were to be working at a different resolution, or were using a different browser with different amounts of chrome. Also includes tools for measuring on-screen X-Y coordinates, for precisely measuring the pixel dimensions of any onscreen object, and so on. It’s been a while since I’ve encountered a piece of must-have shareware.
Music: Kristin Hersh :: Vitamin V
I use it all the time too. Great little swiss army knife of a utility.