[eli]

I disagree. Visiting a malicious website or opening an email that exploits a vulnerability in your os or software is very common.

[FireBeyond]

Citation? The last thing along those lines I'd heard of was the PNG(?) exploit.

[eli]

Well, for one, the Java vulnerability discussed in linked article is actively being exploited on Windows to install that obnoxious fake "Antivirus 2012" malware.

[DanBC]

And those are not viruses unless they self-replicate.