I'm interested to see what peoples' take on anti-virus on their home systems is...
Did you get AV bundled with your PC system when you bought it?
Do you use free AV software?
Did you buy a different AV product?
Do you not use AV at all because you don't think it is needed if you know what you are doing?
I've had experience in corporate environments with McAfee VirusScan & NetShield, eTrust and Sophos.
I've also tried these free products at home: AntiVir, Avast!, AVG 6, AVG 7 Beta.
As I built all my PCs from components, I've never had any bundled AV software, and tend to hear only complaints from people that got things such as Norton or Norman AV (bloated, intrusive, too much of an impact on system resources, etc.).