Do you want to add your own favourite search engine to IE7. Now it is easy. This site, ‘enhanceIE’ shows you how by making a little script to add to IE.
UPDATE: Eric has just commented that this is now obsolete – you can now do the same within IE7, just click on the ‘find more search providers’ on the search box pull down and the page that opens will have a builder for you. Good stuff Eric, thanks.