i dunno what df -h does (since it doesn't seem to exist anywhere except BSD), but i put together a little front end for df -k that will reformat it in MB. it seems to work for solaris, linux and tru64.

use strict;
my $args = join(" ", @ARGV);
open(D, "df -k $args |") or die "Unable to run df! $!";
my @line = split(" ", <D>);
exit unless(defined(@line));
$line[1] = "mbytes"; $line[3] = "avail";
printf "%-20s %7s %7s %7s %8s  %s\n", @line;
while(@line = split(" ", <D>)) {
  for(1,2,3) { $line[$_] = $line[$_] >> 10; } 
  printf "%-20s %7s %7s %7s %8s  %s\n", @line;
}
close(D);
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