Tables should only be used to tabulate data, all stylistic elements should be done using css, this is not just a personal choice it is the reccomended practice endorsed by the w3c. Some more resources on the matter
http://we04.com/resources/we04-introduction/index.htm
http://www.456bereastreet.com/lab/d..._web_standards/
http://www.webstandards.org/learn/faq/