writes "Perhaps no company has been as vocal with its feelings about the revelations about the NSA's collection methods as Google has, and the company has been making a series of changes to its infrastructure in recent months to make it more difficult for adversaries to snoop on users' sessions. The biggest of those changes landed Thursday when the company switched its Gmail service to HTTPS only, enforcing SSL encryption on all Gmail connections. The change is a significant one, especially given the fact that Google also has encrypted all of the links between its data centers. Those two modifications mean that Gmail messages are encrypted from the time they leave a user's machine to the time they leave Google's infrastructure. This makes life much more difficult for anyone—including the NSA–who is trying to snoop on those Gmail sessions."
GMail also does TLS for SMTP, but regrettably Talk (what's left of it) does not do TLS for XMPP server-to-server connections, effectively forcing XMPP server admins to lower their security if they want to federate with Google.