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		 Defacement. Hackers do it for kicks.  
 
At least your hacker was nice enough to leave your files intact and not do rm -rf on your root directory. 
 
Change all of your passwords. Make sure you are using something secure for a password (Firefox's secure password generator plugin with an 18 char password is a good start) and then jump all over your host. Also, if you run a forum, be sure you have updated to the most recent version. Forums (esp. phpBB) are great entry points for hackers. 
		
	
		
		
		
		
		
	
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