NOD32 (www.nod32.com.au ), as it says on their site:
NOD32 still leads the world in virus detection
with an unequalled 23 x VB100% Awards !!!
Thats 23 times they have gotten 100% of the viruses and:
"was the only program to make a genuine "clean sweep" of every virus in every category!" for VirusBulletin. Its also what MS uses to scan all their code before they release their products (remember: It looks for viruses, not horribly written code ;))