This is yet another of not-quite-shady but not-quite-agreeable adjustments we've come to expect from Facebook. It will make it more difficult for me to look up a friend's e-mail address when I want to (since many users won't realize the address on their profile has silently changed). It consolidates Facebook's grip on people's connections, moving Facebook's position closer to a replacement for e-mail (rather than a complement). This is a position I will always reject. Long live e-mail!