Digital Photography School has just posted a fantastic collection of flickr greasemonkey scripts by Martin Grommel.
If you are a flickr user at all (even just a browser), these will improve your user experience no end. I particularly like #1, #3 and #9
And if you aren’t using firefox with greasemonkey – what’s wrong with you? go get it! now!
(for the uninitiated, greasemonkey is a firefox extension that lets you run client-side scripts that customize the appearance and whatnot of webpages that you view as well as other stuff. Probably the single most useful firefox extension out there)