It’s safe to say that you can never have too many tools. No matter what your trade, you will always be more effective if you have quality tools at your side (as long as your don’t bankrupt yourself in the process). Luckily, if your tools are of the software variety, you don’t even need to find room in the garage to store them.
One example of an incredibly innovative and effective set of tools for designers and web developers on the Mac is xScope. XScope is an app that has a wide array of features, allowing you to layout and measure elements on screen in an incredibly “Mac-Like” way. The seven included tools offer everything from color sampling to pixel spacing, and everything in between.