sub scaledbytes {
   (sort { length $a <=> length $b }
   map { sprintf '%.3g%s', $_[0]/1024**$_->[1], $_->[0] }
   [" bytes"=>0],[KB=>1],[MB=>2],[GB=>3],[TB=>4],[PB=>5],[EB=>6])[0]
}
[download]

Update: don't need none of those stinkin' semicolons. Feels kind of funny to use %g but filter out all the exponential forms (unless that's all there are).