Flickr photos are now arriving in planetnomad.com. There's still some style settings to correct in regards to their size in the gmap marker htmlwindows but i'll fix that any day now. It's surprising how many photos are loaded onto Flickr without decent names or descriptions but nevermind, that's what ppl do.
Just like any other feed, e.g. Reuters News Service or Road Traffic News, users can set up to receive emails on new objects as they arrive in a certain area.