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Al Gore's Climate Crisis website has been hacked by spammers using an interesting technique to affect Google's rankings.
Hackers inserted links into the source code of the web pages of Gore's site.
These links were not visible to regular users as they were buried in the source code, but they were picked up by search engine software to affect the position of another site altogether.
Spammers Hack Al Gore's Site & Manipulate SERPs [vnu.co.uk]
Many other sites have been compromised in the same way with spam links pointing back to the same site. All of the compromised sites I've seen run older versions of WordPress. So it appears that the attack is exploiting and old security flaw in WordPress.
[edited by: Robert_Charlton at 6:35 pm (utc) on Nov. 29, 2007]
[edit reason] removed specifics [/edit]