This is probably the easiest method for displaying an image gallery on your site or blog. It takes about a minute or two to set up. Now you can display your flickr photos in style. To build your own go here to the PictoBrowser builder page.
Update: After 4 years (I posted this originally on Dec 8th 2008) this service still works. You do need to have some groups or sets of photos made public. You probably need to log into your flickr account and update some settings if it's not working. But I just tested it as of Dec. 24. 2012 and it still works. Cool! Too bad Flash doesn't work on iDevices.