> Can the netscape 4.xx form tag gremlins (that is, funky space being added
> above and/or below) be cleared with css?

Yes, but you'll have to mark up the element immediately following the
</form>, eg. as class="afterForm", and use:

  form { margin: 0; }
  /*/*/ /*/ form, .afterForm { margin-top: -1em; } /* N4 */

The comment wackiness is a reversal of Caio's hack, hiding the second rule
from browsers that aren't N4.