I know there
are various plugins, addons, widgets and thingamabobs that will allow Safari to bookmark a group of tabs you have open.
If you haven't installed any of these extras or you're just an applescript fan at heart, I found a one-trick script over
that should pull this trick off
just fine. However, I haven't tested this yet, and the script's page doesn't state whether its compatible with Tiger
and/or Panther, so if you try it out, please post your thoughts.