> Proposal:  'etcswitch'.  There would be directories /etc/switch/foo, and
> during boot, if 'etcswitch' is enabled, *before* normal config files are
> read, you get a little prompt on /etc/switch/*, letting you pick a
> configuration.  (Before it nukes your old files, it presumably copies them,
> and you might have a few special ones like /etc/switch/previous.)
> 
> Is this a good idea?  A bad idea?
I've been using that for a couple of years now, and it's quite handy
when you move your computer.  I do it with symbolic link (but only one
needs to be changed when you switch).  I use it to switch the following files:
  amd dhclient.conf localtime ntp.conf rc.conf resolv.conf

    -- Lennart