Well, I would guess that most malevolent things that spread through JavaScript, whether viruses or programs that probe your hard drive, are assuming a Windows machine on the other end. So if I had the Linux box anyway, I'd use that rather than the Windows one for this. (This is one of many reasons that I read email using pine on a Unix box.)
That argument plus the fact that my boss turns out to be less worried about it than I am convinced me to go ahead and temporarily turn on JavaScript on one of my Linux machines. Unfortunately, it seems that the last time I fired up Opera under Linux was before a hardware failure resulted in my having to transplant a drive into a box that doesn't seem to want to run Red Hat 7 ... and I can't seem to get Opera to run under Mandrake 6, so I'm reverting to a pretty old copy of Netscape. I can run JavaScript for a little while before the browser crashes... *sigh*
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