Here are a couple I use in the prevention of bad kimchee.
IE-SpyAd
IE-SPYAD adds a long list of sites and domains associated with known advertisers, marketers, and crapware pushers to the Restricted sites zone of Internet Explorer. Once you merge this list of sites and domains into the Registry, the web sites for these companies will not be able to use cookies, ActiveX controls, Java applets, or scripting to compromise your privacy or your PC while you surf the Net. Nor will they be able to use your browser to push unwanted pop-ups, cookies, or auto-installing programs on your PC.
SpyWare Blaster
The most important step you can take is to secure your system. And SpywareBlaster is the most powerful protection program available.
Prevent the installation of ActiveX-based spyware, adware, browser hijackers, dialers, and other potentially unwanted software.
Block spyware/tracking cookies in Internet Explorer and Mozilla/Firefox.
Restrict the actions of potentially unwanted sites in Internet Explorer.