The toolbar also offers one-click links to sales and deals. And, like most, it provides a Web-search option, which you can use or not. If you like to know the running tally of how much cash you've earned to date, it can display that number -- though you can also hide that info if you wish (something to consider if you share your PC).

I've installed and used the Cash Back Toolbar myself, and to my knowledge, it's caused no harm to my system. Alas, for the moment it's available only for Firefox and Internet Explorer. Chrome users like myself are out of luck.

Whether you're already an Ebates user or new to the service (you can ), this toolbar is decidedly handy to have around. The money you save could be your own. (Come to think of it, who else's would it be?)

Contributing Editor writes about business and consumer technology. Ask for help with your PC hassles at hasslefree@pcworld.com, or try the treasure trove of helpful folks in the . Sign up to have the e-mailed to you each week.