Like many free toolbars on the scene, this one seems primarily intended to promote the developer's services. SEO ToolBar gives you quick access to the most-popular search engines, including Google, Yahoo, and MSN. The program's only other function is quite unique but probably won't be useful to everyday users.
Basically, the toolbar shows you how many pages a particular search engine has indexed for a certain Web site when you enter its URL into your browser. Unfortunately, this toolbar's poor design hinders this feature, as the only results visible are from Google and Dmoz; we assume the rest of the supported search engines are obscured behind the Get Data button.
This free application can provide a Web master with some benefit in its current form, but if it gets a design makeover, it will be an even handier tool.