We can't believe it's taken this long for an app to do this, but Phase2 Media's Email'n'Walk app overlays an email composition window over live video from your iPhone's camera, allowing you to pound out messages while avoiding sidewalk-hogging obstacles. We just wish it didn't rely on the actual Mail app for sending and it'd be nice if it handled SMS as well, but obviously Apple's not going to let that happen. Free in the App Store for now.

[Thanks, Becky; warning: iTunes read link]