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[washingtonpost.com...]
Even after a document has been pulled off of a Web server, as was the case when MTV removed from its Web site a pre-Super Bowl press release promising "shocking moments" at the halftime show, documents often remain cached, or stored, in other search engines' computers so they can still be accessed.
It is also not just an issue that affects the big organisations such as governments and banks, with the growing trend in social networking sites such as Orkut, Ecademy and others there are potential threats to everyones personal data. With Google being involved in Orkut it can probably prevent its own spiders and cache from compormising the data but there are other search engines out there doing similar things.