iPhone only: Email n' Walk overlays an email composition window on top of the view from your iPhone's camera, so you can type out an email and watch where you're going.
Insane? Ridiculous? Of course. It also kind of works. And while we don't recommend putting your life in the hands of your iPhone's camera, it's a clever idea. Though I can't imagine actually using it for its intended purpose, I can imagine using it to do a little spying while I'm sitting down and typing out an email. When you finish composing an email in Email 'n Walk, hitting send will open up a proper email window in Mail so you can choose your recipient and send it. Email 'n Walk is a free, iPhone-only download for a limited time from the iTunes App Store. Email 'n Walk [iTunes App Store via CNET]