> Are there systems that can disable swapping without a reboot?

Solaris 2 has "swap -d"
Linux has "swapoff"
IRIX has "swap delete"

Probably a lot of other SVR4ish things can do it. I have a funny
feeling I remember OSF/1 could do it too, though I might well be
mistaken.

I find it rather useful, especially when I'm about to run something
*BIG* that I don't often run.

Of more importance to NetBSD, however, is the removal of the
requirement that potential swap devices have to be configured in the
kernel. This really is a pain in the butt. 

--
Dan.