No. I mean Macs are obscure, in that there are not a lot of them, so they are not seen as a high priority "target". But that's only a small part of why there are zero virus' doing the rounds.
Look at what those bugs, (none of them exploited in the wild) actually are, how many are remotely exploitable, or how many are actually exploitable at all, then compare that to the 10,866 virus and variants created and spread in the first 6 months of 2005 for Windows. In terms of home users, Macs are a lot more secure, there are absolutely no exploits in the wild for them.
Ask any mac user if their computer has been affected by a virus or spyware, you won't find any.
Plug a Windows machine into the internet, and the average infection time is under 15 minutes.
I'm not going to go there. Those who own them know it's true. Companies which have switched know it's true. Windows keeps a whole industry of IT people employed ;-).
Well with ZERO virus spyware and exploits in the wild. I'd agree with that... for now.