Email'n Walk lets you see right through your iPhone

A new app hit the app store this week which might be something for those who send emails on the go.  Email’n Walk (iTunes link) turns on the iPhone camera and presents the video as a backdrop to your email entry page.  The idea was apparantly originally an April Fool’s gag.

We like this implementation but aren’t sure how it will work in practice.  Won’t the camera just be looking at your feet?  Perhaps it depends on what angle you send emails at.  Anyone try this yet?