Its free antivirus tool is one of the best regarded on the market, and AVG is now expanding its offering by making its LinkScanner real-time web protection tool available for free as well.
LinkScanner (previously only included in AVG's paid version) analyses links when you click on them, checking the target page to identify any potentially malicious code and blocking access if the page includes a trojan, drive-by download or other unwanted nasty. (Similar features are found in most commercial security software suites.)
Savvy Lifehacker readers might trust their own ability to identify dodgy sites, but malicious code now hops around the Internet so rapidly that instinct alone is not going to protect you. The product is also a useful suggestion for less geeky friends and relatives worried about Web-based threats. AVG LinkScanner is a free download for Windows only. (Note that you don't need the AVG Toolbar cluttering your screen; the scanning service works regardless.)