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Comments
It has the official LEGO color palette (for 2011 - so it might not help with the older stuff) and links to @siderdd's excellent comparison of the different blue bricks.
Another good method is to go on bricklink and find uncommon pieces, and see what colors they were available in. That will at least let you eliminate some color possibilities.
http://www.peeron.com/cgi-bin/invcgis/colorguide.cgi