AVG misses 5.8% of current malware.
The best misses 0.4% (G.DATA) and the best free one misses 0.7%.
http://www.av-comparatives.org/index.php?option=com_content&view=article&id=144&Itemid=152
I shall check them out.
Looks like that should be the free one (Alwil Software Avast Free 5.0.396) misses 3.7%, not just 0.7%.