I wrote about it at the SEW Blog yesterday;
Techmeme is reporting a huge amount of concern over AOL releasing, then pulling, search logs done by 500,000 users over three months. The purpose of the release was to help search researchers better understand user behavior in conjunction with an industry event for search researchers happening in Seattle, SIGIR. The data was posted on the AOL research site, but has since been pulled.
Much more at SEW blog, Danny postscripted later on.