Bill blogged on the emergence of Viruses on CE. I've been in computerworld a couple of times over the past month (here and here) discussing both the CE virus and the Symbian one. The underlying theme of my comments is that once virus devs start really taking advantage of the inherent capabilities and weaknesses of the platforms themselves.

Think about how nasty a virus that flashed your rom image could be... how hard would recovery be from that!?! Even a hard reset wouldn't save you.