Tagerator is a project mainly written in JAVA and SHELL, it's free.
A program to get information about your Flickr photostream tags.
Tagerator http://jeremybrooks.net/tagerator
Tagerator will scan your Flickr photostream, counting the number of times a particular tag is used. It will then display the results in a table, so you can see which tags you have used most often.
Tags are saved in a file and can be used to generate a tag cloud, or you can view all the tags and use them however you like.