Shoney's wouldn't be able to subpoena telephone company records to see who left anonymous voice mail messages or made anonymous phone calls. My wireless company provides me a printout of all my phone calls. Fifth, ISPs and other Internet companies are going to be routinely subpoenaed. The advantage to this is that you can then access your personal files in order to synchronize the information on your desktop and laptop. Turbotax allows you to prepare your tax return online.
Most people regard their calendars, address books, and tax returns as highly personal.
I periodically call attention to developments in this area of the law because it appears to be in a state of flux. As more and more communications take place online, I suspect the current approaches of the wiretap and stored communications statutes will have to be reexamined and harmonized.