I have the Huey Pro - works nice on my Nokia monitor (bought out by ViewSonic in the mid 90's). However, when I get rich - I will go buy a ColorMunki
ColorMunki - ColorMunki Photo because it wil build ICC profiles for your camera, monitor and printer. You can even get color readings off of walls, paint --- etc. Looks cool, but it is just too expensive for me to run out and get.
The Elitist - formerly known as PDL