Not much to this one. It's about like the recent Mac malware discoveries.
Back in the days of Red Hat 5.2 (my first Linux distro) Deepak and I would debate out loud how long it would take malware writers to target Linux and the Mac OS X. The general consensus was that it would not be too long. I believe it is starting to happen, years after we thought it would.
When there gets to be a considerable amount of malware for the alternative operating systems, we'll all get to make more of a "head-to-head" comparison of the security of those versus Windows. I wonder how that will come out? There's no telling, right now, though I will note we are a long ways from having a community of script kiddies salivating over the prospect of their own personal piece of badness infecting machines, as Windows has had for years, now.