http://www.mezzoblue.com/archives/2004/05/13/gasp_tables/index.php
...has an objective look at it.
How about this article, helpfully titled "Why tables for layout is stupid".
http://www.hotdesign.com/seybold/
Also, I highly recommend Jeffrey Zeldman's book "Designing for Web Standards". It's a great read, for zealots and non-zealots alike :)
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