How can I remove geolocation info from a picture on an iPhone? Since geolocation info is usually preserved when I share a photo from my iPhone, I was wondering what the simplest way is to remove this geolocation info from an existing picture.

To be clear: I don't want to take a new photo, and I don't want to disable the option that geotags my photos. I just want to take an existing photo, remove the location info (e.g. by duplicating it, while retaining the original size), and then send it to a friend.
There's an App called GeoZapper ($1-$2) (or a free, limited Lite version), which will remove geolocation info from pictures.

If you know of any other apps or alternative methods to remove this info, please post them.