Xyle scope CSS Tool for Analysis, Debugging, and Fine-tuning

"Using Xylescope is like surfing with an x-ray vision. You will immediately see beneath the surface of the web pages you are visiting. Experiment by changing CSS values in author style sheets - no matter if they are on the internet or on your own computer."

This is a nice tool. It's kind of like taking the CSS features found in the Web Developer Firefox Extension and turning them into a powerful desktop app (Mac only). I had been using the demo for the past month, but the recent review on Vitamin got me to commit and snag a license. This will be a useful addition to my CSS toolset.