I use search engine plugins  on my web browser Firefox on both Mac OS X and Windows XP.
The first time I encountered this site I just added some of the popular search sites listed on the main page -- Yahoo, IMDB, and Wikipedia. Then I wanted to add Gigablast so typed gigablast into their search box and found it. Then I searched on lii and added the Librarians' Index to the Internet to my browser's drop-down search box! A neat feature is that you can easily change the default search. Most often I have it on lii.org as I also use the Googlebar , an extension for Firefox.