2008:WebsiteDesktopDownloader
Written using ruby and the Watir framework.
I can give it a web page with desktops for downloading. It will start up an IE window and browes through all the desktops, select the largest size of each one from a drop down list, and record the link for downloading.
I tested my script on one site and downloaded over 700 megs of wallpapers in a couple of hours!