I’ve made another wee Flickr App.  This time you can search groups for keyword, between certain dates. It will then return the photos that have those keywords in the title,description or tags.  You then get the choice to either click on the the photo to be taken to that photo’s page, or you can click to have the code for that photo added to a textbox(which can the be copied) which will allow you to use on flickr groups, or wordpress.

Again, this uses PHPFlickr which is a great PHP translation of the Flickr API.
I’ve also done a flickr group searcher which can be seen here:

http://www.goatkarma.com/2009/08/introducing-flickr-group-searcher-and-flickr-favourite-searcher-with-auto-code-generation/