The Firetrust SiteHound Toolbar. Freeware browser plug-in that warns about potentially dodgy phishing, spyware or other malware attacks. Internet Explorer only (Firefox coming?) and you have to pay $19.95 to get all the bells and whistles, but maybe still worth a look?
With SiteHound, when you browse the Internet, you’re shown a warning page every time you go to a site which is a known scam, potentially loads viruses or spyware on to your computer, has questionable content or anything you would not consider reasonable. Of course we don’t want to block you completely from visiting the site if you really want to visit it, instead you are shown a warning page with information about that site. From there you can choose to enter the site or go back.