TechCrunch is reporting that AOL has made available the search histories of 650,000 of their users. The user account name is replaced with an ID number, but as Michael Arrington correctly points out, there is often enough information in search queries to determine the user's identity anyway.
This is a real blow to AOL as they are trying to revamp their service and become more relevant (dumping dial up and focusing on advertising) to a broader audience of consumers.
This is just BAD. As of 7:30 PST, TechCrumch has reported the file has been download 800+ times.
Update #1 - SiliconBeat also has a post on this story.
Update #2 - AOL has finally taken down the data file. The link points to a blank page.