Flickr supports various useful feeds. Flickr supports geocoding (or geotagging in Flickr language). Flickr’s feeds do not however contain GeoRSS markup for geotagged photos.

It’d be sooooooo cool if someone at Flickr noticed and decided to implement GeoRSS. You can nearly work round it now - the feed contains all of an image’s tags as RSS categories. Unfortunately the geotagging tags have punctuation in them, most importantly the decimal point in the longitude and latitude, and Flickr strips punctuation out of the tags that appear in feeds.