Text Color Combinations and Eye Strain?

jalewis asks: "I was staring at the screen and the white background started to pulsate. It made me wonder if maybe my Eterm color choices are bad for my eyes. Is there a combo that put the least amount of strain on your eyes?" I can understand this. I remember back when those monochrome (yes, monochrome! I'm dating myself again) monitors came in terrible shades of red or green. I really appreciated CGA cards with their better handling of text colors when I first started working on PCs, as for general text, I'm still partial to greyish-white text on dark backgrounds. What foreground/background text colors work best for you?