Thrashing Through Cyberspace: AOL Eavesdrops, Grants Itself Permission To Steal Your AIM Conversations is a pretty shocking entry covering changes in AOL's Terms Of Service for AIM.
AOL essentially claims all rights to whatever you send through AIM, including rights to publish. The new policy explicitly spells out "You waive any right to privacy. You waive any right to inspect or approve uses of the Content or to be compensated for any such uses."
So when will the first book with people's private conversations come out? Even if it seems pretty unlikely that AOL will do something like that, this new policy does give them the right to.
It also explicitly deny you the right to any compensation or to approve such uses upfront.