Viruses don't affect other phones, despite other smartphones being open (i.e., developers freely allowed to write applications and distribute them ). There are viruses out there, but the security models of the OSes are good enough. iPhone must have a very very weak security model.
I think Apple's parania says everything: The iPhone is still a beta product that is very weak. It 'just about' works, and thats it.
iPhone is a weak beta product??? Mine works consistently great, which is why I want more applications on it. I've not had problems with my i-phone, so if this is beta, boy am I excited for the final release.