The Ninth Circuit recently held in US v. Forrester that the Fourth Amendment does not protect against government surveillance of the to/from addresses of one’s email messages, the IP addresses of websites one has visited, and the total volume of information transmitted to or from one’s ISP account.
http://www.eff.org/deeplinks/archives/005358.php
us: Ruling Endangers Privacy in Email and IP Addresses
The Ninth Circuit recently held in US v. Forrester that the Fourth Amendment does not protect against government surveillance of the to/from addresses of one’s email messages, the IP addresses of websites one has visited, and the total volume of information transmitted to or from one’s ISP account.