You probably encounter more shortened URLs these days. These links, while convenient, are also a great way to hide a link to a malicious site. You can blame Twitter for their proliferation. With only 140 characters, tweeting a full link is impractical. Now AVG is stepping up to the plate to offer a method of protection.

AVG’s LinkScanner security product now fully supports shortened URLs. AVG says the LinkScanner system is more reliable than other methods because it tests links in real time. Whether or not it's the best, it is free.

The free malware scanner, Ad-Aware, has also added new features. The new enhancements are aimed at detecting and removing rootkits. A rootkit is a piece of malware that specializes in getting deep into the operating system to avoid detection. Ad-Aware uses heuristic detection to search for these nasty bits of software. It is also able to stop certain types of malware from restoring themselves after a reboot. Ad-Aware is a free download [warning, attempted upsell],  and well worth having a look at.