CHAOTICPIXEL An absolute must have, but realize that it is not a competitor of CSSedit or any other CSS writing app. This is meant for the polishing stage of web design. It helps with CSS rules, drilling down to what line of code is causing the problems and experimentation.
I do a lot of redesign, so I am not worried about writing CSS from the ground up. I usually have to modify someone else's work. And since all programmers don't code in the same fashion, it can take hours of work to figure out how some people layout the styles. Xyle scope gets right down to the lines of code that I need to modify to change HTML elements, easily, effectively and efficiently.
I use this app every damn day!
(Version 1.2.3)