I'm experiencing very annoying trouble out here. My font rendering is kind of blurry when it comes to dark backgrounds. Here's a screenshot using Swyphs II color theme. My rendering is on the top of the screenshot, author's is at the bottom, after the red line.
http://berkana18.com/screen.jpg
Font smoothing in system perferences is set to 'Automatic', and i'm on Leopard, 23" ACD.
You might try changing the smoothing value to "Light"; I've found the "Automatic" setting to be rather mushy on LCDs. On displays inferior to the Cinema Display (a pair of Dells at work, for example), I've just gotten used to a certain amount of fuzziness. :/
~ Daniel