http://bugmenot.com
It's full of passwords that users submit so you don't have to login to websites.
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Theres a good comments system i use, called page comments scripts. However it's in php and not html. If you have php installed and htaccess enabled you can use php in html.
http://www.digitalmidget.com/php_noob/comment.php
As MeEtc said, it will be much easier using php.
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Good flash music players
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