It's a nightmare virus - when it first came out, our smtp gateway at work was letting the whole lot through
Thankfully, all the clients were uptodate with definitions so were picking it up, but we've been getting around 300 a day into quarantine. Symantec were great with their support, and sent out a fix for the software within 30mins of me asking them (this problem was related to only some builds of their smtp gateway software - typically we had that).
What everyone should be aware of though, is that the W32.Novarg.A@mm virus does still sometimes get through a/v filtering thanks to the way some of the zip files are built.
The virus is quite clever though - I wonder how many random names it has written into it, we get every name under the sun @milford-docks.co.uk, @mhpa.co.uk etc... - some work, 98% don't!!
So far though, I haven't had one to home, which is amazing - lucky really cos the parents don't even have an a/v client