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I think, only way would be filtering IP's out and firewalling them till they stop bothering you.
Sounds tedious, but any other filtering method will involve web server processing those request anyway.
Depending on what they are hammering and how smart those bots are (eat cookies, know javascript), it might be worth trying to redirect them to some other domain like msn.com via .htaccess ? Could lessen the load possibly if they hammer your PHP/SQL.
Just brainstorming, hope it helps!
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