Some people love to change the desktop wallpaper at intervals, If you fall in this category then automate the process with Wally.Yes, Wally is a FREE program which lets you change the desktop wallpaper automatically.
All you have to do is to set the source from which the program can load wallpapers.The wallpaper images sources like local files and folders, FTP remote folders, Flickr photo stream, Yahoo, Panoramio, Pikeo, Ipernity, and Photobucket images etc available with the program.
You can further customize the appearance of wallpaper like

Start automatically on system …

DocJax – is a new documents search engine powered by Google and Yahoo search engines. It list all top documents results from Google and Yahoo, Simultaneously it searches for all popular document formats(PDF, DOC, XLS and PPT).You can even limit the format to be searched (like only searching for PDF files).

This document search engine can understand most search operators including
site:, intitle:, inurl:,site:edu (for searching university sites )
So you can easily filter junk results
If you want to search only documents from university websites.Just search for
site:edu Nanotechnology

Advantage …