Google has a downloadable registry entry for IE on Windows which puts Google in the Search Bar. You can do nearly the same thing on the Mac by hacking into the program files and risk messing up IE (this wouldn't be a bad thing!?). However, to do this on the Mac easily and simply, just go to Google's IE webpage, click the Page Holder sidebar button, and drag the "@" symbol by the address bar to the big blank space.
Now when you click the page holder sidebar button, you can get Google search results in the sidebar!!! It stays there for every session of IE. This should work for the Classic version of IE as well, but why boot Classic up to test it? Just a waste of time!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020718073729295