Add this to the "stuff you don't need to install software to do" list: editing the EXIF data of an image (or a batch of images) on the web, for free. The *exif.er* service (do consider a small donation) will let you upload your photo(s), edit their metadata and provide a copy with your updates. All in a simple single-page interface. No up-selling, no popups.
Credits: Andrea Piaggesi Use it: http://bit.ly/1GNrXk9