Slickr is a free screensaver that gets photos from flickr – you can choose any user, tag or group as the feed for the screensaver. This is pretty much what I have been looking for my pc in work. It does lack a couple of features like selecting multimple tags or users, but hey, its beta and theres a good chance more features will be put in – its already been popular on digg.com and elsewhere.
Needs .NET framework and Windows.
Grab it here – cellardoorsw.com