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It varies on the book. The fontsize and paper have a big influence on the quality. I find that my OCR errors drop significantly when I scan at 400dpi grayscale/color instead of 300dpi grayscale/color. Of course for books with big letters the increase is not as much, but for massmarket paperbacks with small letters I have up to 80% less OCR errors. Keep in mind that ABBYY is already doing a great job at 300dpi.
There is no golden rule, it really depends on the source. I scan at 400dpi, because it is only a bit slower and not much bigger.
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