Compfight is a great new tool that uses Flickr's API to search the database of photos (including the option to do full-text search on titles and descriptions, and to limit searches to Creative Commons licensed works only) and then feeds back the results as live clickable thumbnails. Unlike Flickr's own advanced-search page, Compfight remembers your settings from search to search (great for me, as I'm always foraging on Flickr for CC-licensed stock photos), and the large quantities of search-result thumbnails per page makes this the ideal choice for playing photo-editor.
(Thanks, JJ!)
