PicLens
Another Firefox plug-in that I can recommend is PicLens. PicLens transforms your browser into a full-screen "3D Wall" that lets you view images on the web by letting you effortlessly drag, click, and zoom your way around a wall of pictures. PicLens currently works on Flickr, Smugmug, DeviantArt, Photobucket, Picasa, Facebook, MySpace, Bebo, Hi5, Friendster, Image search on Google, Yahoo, Ask, Live, AOL and a growing number of Media RSS-enabled web sites
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This is cracking! I have had great fun with this on myspace. You can look at people's pictures without having to open their page.
It's great!