The BBC is reporting that the Article 29 Working Group in Europe is calling on search engines to render their logs anonymous after six months.
BBC NEWS Technology Search engines warned over data
... The report from the Article 29 Data Protection Working Party said search engine providers had "insufficiently explained" why they were storing and processing personal data to their users.
It said "search engine providers must delete or irreversibly anonymise personal data once they no longer serve the specified and legitimate purpose they were collected for".
The report said the personal data of users should not be stored or processed "beyond providing search results" if the user had not created an account or registered with the search engine.
The advisory body also said it preferred search engines did not collect and use personal data to serve personalised adverts unless the user had consented and signed up to the service....
Google has recently reduced its log retention to eighteen months while other search engines are in the one year to one-and-a-half year ballpark.
Via the ever vigilant Slaw. For Google's previous announcement on retention, check out Canadian Privacy Law Blog: Google to anonymize older data.