The Geoblogger project which is combines Flickr and Google Maps appears to really be gaining some steam. This map of San Francisco shows what is possible with this latest Google Maps hack.
This concept looks a lot like Thickey's Goolickr.. You might remember my post about her start and finish of this hack-up she creaetd a few weeks back.
This process is called "geotagging". There is already a geotagging group on Flickr if you want to get started.