Not sure how much you bother with CM, so: with a CRT you can use Adobe Gamma (or Colorsync if you're on a Mac) to generate a quick-and-dirty profile for your display which enables PS to know what actual colour is being displayed on your screen when any given RGB value is sent to the adapter. If you have similar profiles for your printer (which usually means using the manufacturer's paper and ink) then the software has all it needs to give a fair match between screen and print, allowing for the difference in colour and brightness ranges between glowing-phosphor-on-glass and dye-on-paper. If you spend (lots of) money on the right hardware and software you can get an even better match. Unfortunately, to the best of my knowledge, none of the free/bundled screen profilers and few of the pay versions work on LCDs, and you are also limited by the inability to adjust brightness and contrast on most models of LCD. There are tools that work, but they tend to be pricey.