I installed the version 0.1 version of "flickr to WP" plugin with WP 3.3.1.
I tried to activate it in the plugin admin page (entered a valid Flickr IP key and secret, as well as the callback URL), but got a:
Oops! Flickr can't find a valid callback URL.
Don't know how to solve it for the moment, if anybody knows how to do, let me know.