Hey, that was an excellent discussion about the dangers of trusting automatic binary updates/installs. Given the way that the Linux software distribution method is in effect at this time, I wonder about things like this - why don't we have trojan horses and virii to the extant that we possibly could? In truth, I believe it has to do with the way that the Linux system is designed and the way that software is distributed. In fact, I have noticed that in most cases, people who code Linux software are rather outspoken about their work, making web-pages and such to describe it - this makes them more than just faceless coders. The community, and the ethic of Linux itself, seem to be the main reasons why we do not have the kind of problems that Windows has.
However, if Linux did have these kind of problems, I do not doubt for a second that these "automagic" install methods would be targetted. It is wonderful that we have the trust that we have here - but maybe all the distros should start looking into some security, for peace of mind, of course. :)