iPhone's 'Email 'n Walk' Lets You E-Mail and Walk at the Same Time
Free for a limited time, Email 'n Walk for the iPhone lets you safely (in theory) compose e-mails while walking by displaying a video feed taken live from the camera underneath your message. So, now you can see where you're walking while you type, without the distraction of looking up every few seconds.
Of course, this will only show you what's directly in front of the camera, so you'll still have to be careful of low hanging tree branches and telephone poles. [From: Apple iPhone Apps, Via: Textually.org]