CIRONLINE.ORG has a fantastic report on how easy it is to get personal data on people. This is all the reason anyone should need for getting out of Google and other big email providers:
Even if an investigator faces some hurdles with your inbox, such as Google insisting on a warrant, email is not entirely protected. With a court order that doesn’t reach probable cause, Google will give up your name, IP address, the dates and times you’re signing in and out, and with whom you’re exchanging emails.
Well worth the read of the entire report, but none of the report is good news for privacy advocates.