There are varieties of search engines, all culling content by different means. Which gets to my prior post on the limitations of only running your search through Google.
The word, many words have circulated about the new Microsoft MSN search engine, which has a clean look copied from THE most popular search engine but ranks content very differently. It also offers a desktop toolbar, the new area of total computer content searching –retrieving files saved to your hard drive along with those on the Internet. The ins-and-outs of this newly designed search engine has been written about here
and more discussion over here.