I am not a big fan of toolbars. In order for me to install one it really needs to be worthy of regular use.
The Seo Mozbar is one of the few I use on a regular basis, and comes packed with useful features and tools.
Use it to analyze your website and pages or the competition.
You can jump right to Yahoo’s Site Explorer inlinks for any website. Go directly to Google, Yahoo, and Bing indexed pages, and much more with a few simple clicks of your mouse.