Symantec and SONAR
Symantec bought some time ago a company called Whole Security, which has a very interesting malware detection product that wasn't signature based (it was behaviour based). It happened so much time agor that I thought Symantec was going to simply kill the product. But now there are news that they are putting WS technology in the Norton Antivirus, with a new name, SONAR. Very good, I really want to see this thing working!