CNET highlights Email 'n Walk [App Store, Free for a Limited Time], a new application that utilizes the iPhone's camera and a transparent window to allow users to compose e-mails while keeping an eye on what's going on front of them.
The idea is simple: start up Email 'n Walk, type in your subject, and start typing a message. While you write, Email 'n Walk uses your iPhone camera to show you what's in front of you so you don't run into anyone. I took it for a test run outside our offices here in San Francisco and even though it felt a little silly, the app works as advertised. When you're done, hit send and you'll be transferred to the iPhone mail app to add recipients and send your e-mail.
As the application's developers note, users should obviously observe caution while using the application and remain aware of what is going on around them at all times. While the application could certainly be of some use while stationary or possibly walking, attempting to use the application while biking or driving, for example, would be incredibly unwise, needless to say.