The guilty party here is IE, not apache. I just compared IE6 to N4.76, both on win2000. IE won't display anything before it has read about 230 bytes. If you then reload the page, there's no buffering.

quick fix:

print "<!-- hey IE, display this page already -->\n" x 5;
[download]

--
Brigitte    'I never met a chocolate I didnt like'    Jellinek
http://www.horus.com/~bjelli/         http://perlwelt.horus.at