AVG LinkScanner

Even if you trust yourself to recognize bad web links in your browser, I have to recommend AVG's LinkScanner program. This program will check every link you click in real time and keep you from dangerous sites. It doesn't have a problem co-existing with other security products, however, you may need to disable it before LinkScanner will install.

Download the application from the following web page.
http://linkscanner.avg.com

After you have installed it you can test it out by clicking the following link and looking for the big red X next to potentially dangerous sites Dangerous Google Search