Useful Software: Free Ruler

When I upgraded my OS I lost my OEM license for Art Director's Toolkit. I had thought about buying a license for the new version, but the only feature that I want of it's two-dozen or so is the pixel ruler. My wait has been justified by Free Ruler, a ruler application. It is a far superior screen ruler to the one in Art Directors Toolkit in every way except that it doesn't appear to support the rulers as a window that floats in front of every other application. Also, the rulers are not collapsible, which is no problem since they don't float in front of every other application. I think this app will be running just about 24-7.