Just a quick note...
While this allows anyone on G+ to e-mail you by default, it does not give them access to your actual address unless you reply back to them. So everyone worried about their "super secret, no one knows" e-mail address, it's still going to remain that way. I've been an avid Gmail and G+ user, and first thing this morning received an e-mail from Google detailing the change, as well as a way to turn off the functionality. That's more than I ever received from FB when they made changes to my account.
Biting the hand that feeds IT
