Screen Ruler ... Do you need a way to measure the distance between two points on your screen? To get the exact location and size of an element on a Web page? To measure in different units? Screen Ruler could be your choice. It comes with multiple-display support (with calibration wizard); rotation & angles support; different figures (rectangles, squares, circles and so on) to measure area and perimeter and a lot more... This is the first Mac version (the tool comes with PC version too for your other computer)
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This definitely is well thought out and implemented, with many options however, for my needs it is overkill. If you are looking for a basic ruler check out Free Ruler.
Hmm, I really have to say that I enjoy Xyle Scope. I may give this a look over, but for the cost (free) and features, I just don't see any compelling reason to try this app.