Your post caught my eye. Since I mentioned earlier that learning perl was a good investment, thought i'd just show a quick equivalent to the awk script in your blog post.

This produces same output as your awk script (except it's sorted alphabetically):

  #!/usr/bin/perl -F, -an "$@"
  $wins{$F[0]} += $F[6];
  $losses{$F[0]} += $F[7];
  END {
    print "manager,total_wins,total_losses\n"
    for (sort keys %wins) {
      print "$_,$wins{$_},$losses{$_}\n";
    }
  }

EDIT: should also mention that you can automatically convert awk scripts to perl with the a2p utility which should already be installed along with perl.