Which accounts (twitter, gmail, etc) should I secure?
RobGR: Every new facebook, myspace, webmail, etc creates another namespace.  It's not necessary to have your name in all of them, and can be a bit of distraction to focus on that.I second the recommendations of gmail and twitter, although I don't use twitter.  If you are thinking of having an SMS interface, especially if you want to beta test that without much infrastructure investment, you might want to also look into www.textmarks.com.