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The problem with white text on a black background is bleed. With a printing press when the inked metal print was pressed into the paper, around each letter some of the ink bled into the surrounding paper. With an lcd (or crt) you get something similar with a slight glow of the white pixels encroaching on the black areas adjacent to them. It's happening on a very small level but it's there. Good font designers take this bleed into account, but they do it assuming the text will be black and the background white. When you use that same tweaked font as white on a black background it can look different and be hard to read.
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