ajooja

The Google Toolbar is a very useful utility.

alexa.com - The Alexa toolbar blocks popup ads. Read their privacy policy as their primary purpose is to aggregate web usage data to display how popular the sites you visit are.

toolbar.msn.com - The MSN toolbar features web search and popup blocking in addition to quick links to MSN properties.

Allows users to create annotated comments on top of search results powered by Teoma. Offers a downloadable search toolbar.

Offers a freeware toolbar with metasearch and other tools.

The SearchHippo toolbar.

A toolbar by the Mozilla community for Netscape 7/Mozilla which emulates all of the basic search functionality of the Google toolbar.