Maybe that's because Windows is now so full of warnings... granted that Win7 is a LOT better than Vista, which was a bad joke.. . . and my experience is that "fierce skepticism" is a lot easier for me to bring to the Unix box than to the WindowsTM one.
No, My dealings with Windows pretty much stopped with Win 98, when I fell for a trojan because I was so worried about Windows viruses. Shortly after that, I saw a shiny new OS X box, and I haven't looked back - except to upgrade to an intel box so I could run Leopard.I run one of my Win7 boxes with the default UAC (User Account Control) setting, and another with it somewhat looser (it's a crashbox for debugging new software, nothing much to lose). The "default" UAC setting quickly taught me that most users will get so jaded and bored "clicking through" the warnings, that they might as well just turn the warnings off entirely.
There simply aren't any OS-X viruses in the wild, so the warnings are just BS at present. (Trojans, yes, because they are attacks on the USER not the OS.)Some Windows users posting here seem to take offense at my attitude of "fierce skepticism" related to OS X virus warnings. As far as I'm concerned that's their problem, tho . .
.
Incidentally, your old PPC box will still run Linux just fine. I'm running Fedora Core 10 on my PPC MacMini. And it will read Mac HFS+ disks, easing volume sharing and whatnot. :)