Album zipper is a facebook application that produces zip files containing pictures from facebook photo albumns. This allows users to put pictures on other sites, send to none-facebooking friends etc. The idea was inspired by observing a friend methodically downloading each picture manually.
Album zipper is a lot more independent than some similar apps because it is all server-side. Other apps require Java, flash etc. The app should also work from any mobile phone browser.
Main site: apps.facebook/albumzipper