Slickr
This is a really slick screensaver (hence the name) that pulls images from Flickr and does a nice Ken-Burns-Like fade between them in a screensaver. You can chose to only use your Flickr images, or certain groups, or just random photos (that’s what I’ve got mine set on).
Retrievr
This is just a cool little tool that lets you draw an image or shape and it calls up Flickr and brings back all the images that (somewhat) look like your drawn shape.
Oh, its only for Windows.
Anybody have a link to something as cool for the OS-X?