Colorspace is a universal color picker for web developers and designers. The application can be hidden in the task bar (requires Java 1.6) and lets you pick colors from anywhere on your screen.
Full Specifications
What's new in version 2.6.3
General
ReleaseJanuary 23, 2011
Date AddedJanuary 23, 2011
Version2.6.3
Operating Systems
Operating SystemsMac OS X 10.4 PPC, Mac OS X 10.5 PPC, Macintosh, Mac OS X 10.5 Intel, Mac OS X 10.6, Mac OS X 10.4 Intel