I like light on dark, as you say, but not bright on dark, as whacked said. Light gray or grayish blue / green on on black or dark, dark red is my preferred. I keep a .txt on my desktop with html in it to make font exactly how I like it. On sites that have bad colors, I just paste the text in between the innermost tags in the .txt, save as 'blah.html', and read at ease. :)
