Came across this plugin today for Firefox, IE and Safari (also works with Netscape 9). Basically it takes a series of images on a page and converts them into a 'gallery' of images that can be scrolled through. Images can also be made bigger, or full screen. I found it works really well with Flickr Groups, but I tried it with Smugmug and it didn't work at all. I haven't tested it very much, but if you view the demo you'll get the idea...
Oh yeah, the link: http://www.piclens.com