ZooomrRSS is based on the wonderful FlickrRSS, it's currently in alpha stages but works "just fine". The point is to use the Zooomr Built-in RSS feature to use it to show your latest flickr images. Also has a built-in caching function.
ps: currently works with the default functions the same as FlickrRSS. I'm going to make some more edits and make it work with a different function, as well as with the default (for compatibility with themes that are flickrrss enabled such as k2)