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mattur - 11:39 am on Jan 14, 2007 (gmt 0)
The relevant WCAG1 guideline is 2.2 "Ensure that foreground and background color combinations provide sufficient contrast [...]" and this is good advice for all users, with or without impairments. Light text against a light background can be hard to read for everyone. Try the Colour Contrast Analyser Tool [wat-c.org] to help assess whether your colours are of sufficient contrast for easy readability.
What do you mean by "meaning"...?