Got more information on ClearType. It works as follows:
An LCD screen has pixels (1280x1024 in our case) which are composed of sub-pixels, which are Red, Green and Blue. ClearType uses these subpixels as if they were themselves pixels, to smooth screen fonts. For example, if you had black text on a white background, the "inner" pixels in each font character would be black as normal (these are the pixels that are black without anti-aliasing or ClearType). In the pixels bordering these black pixels, ClearType goes to work and also alters the subpixels of these neighboring pixels, in a way that is supposed to smooth the fonts.
Continuing with this black-text-on-white-background example, you can see the consequence here.. the border of the font characters will not be black or shades of grey (as one would expect with anti-aliasing). The bordering pixels will in fact be
colored. This is the... uh... genius of ClearType.
One reason it may be particularly noticeable on the 1800FP is the relatively large pixels.. I believe they are .28 or so, but I cant remember.
You may be asking yourself... "Self, why dont they use ClearType on CRT monitors? They have subpixels too..." The answer is, ClearType is BS. Any benefit you perceive as a result of ClearType can easily be attributed to the fact that the fonts are now thicker due to the neighboring pixels being "smoothed" into the font.
This smoothing is exactly why anti-aliasing algorithms were created. Use anti-aliasing, and forgettaboutit.
If you want to examine this coloring effect for yourself, simply turn on ClearType, go to a black-text on white-background screen, hit printscreen, paste it into Paint, and zoom in on the text. You can easily see the colors. If you can't get this to work, PM me and I'll see if I can email you a screenshot.
If you are immune to MS's special brand of logic, you can go
here to read what I just told you (or tried to) in MS's words.
EDIT: It is not entirely accurate to say that the inner pixels of your fonts will remain black with ClearType. ClearType knows no boundaries! I notice that on my CRT, I can easily see that the main body of the font is blue in places. Go figure. Also note that the actual coloring effect you get will depend on what selections you make on MS's ClearType config site. Still, the fact remains that ClearType works through coloring.