information aesthetics has a pointer to two fun tools for exploring the growing Flickr tagspace: tagnautica and flickr tag browser.
Both use a similar visualization paradigm with the ‘keyword’ in the middle and related tags in a formation around the keyword. You can explore the related tags (and thus change it to the current keyword) by clicking on the bubble of your choice.
Shameless plug: I am an avid Flickr user; a random sample of some of my photos can be seen in the right gutter of this blog or directly at Flickr.
technorati tags: flickr, visualization, tags, tagging