Flickr is a free, interactive photo management and sharing application that strives to achieve its goals of "Helping people make their content available to the people that matter to them" and "Enabling new ways of organising photos and video" (Flickr 2009). Flickr works on the basis that you can search for any topic, and all photos that have been labeled or "tagged" under that topic will appear.
I created an account on Flickr to document some of my adventures in Perth.
Check them out by clicking here.
Above is one of the photos that you can find on my Flickr.
Flickr 2009, 'About Flickr', viewed 13 August 2009, http://www.flickr.com/about/