I have a couple of perl powered web pages that are used for monitoring servers/services at $work. I'm not at $work at the moment, but IIRC, for the pages that I want to have automatically refresh themselves I put the following in the header (where refresh is usually 90 or 300 depending):

# config stuff:
  my $cfg = {
     refresh  => 300,
     interval => 5,
     };

# at some point later in the script:

  my $expires = strftime("Expires: %a, %d %b %Y %H:%M:%S GMT\n", 
    gmtime(time+60*$cfg->{interval}));

  print <<"EOF";
Content-Type: $content_type
Refresh: $cfg->{refresh}
Pragma: no-cache
Expires: $expires

EOF
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