from c/net news:

The U.S. Department of Justice is quietly shopping around the explosive idea of requiring Internet service providers to retain records of their customers' online activities.

Data retention rules could permit police to obtain records of e-mail chatter, Web browsing or chat-room activity months after Internet providers ordinarily would have deleted the logs--that is, if logs were ever kept in the first place. No U.S. law currently mandates that such logs be kept.