This is the little (well actually, much compacted, and obfuscated) script I wrote to generate the encoded data for the japh script you see above.

If you like tossing over obfuscaion in you head, don't start with this, it will probably give away the algorythm too easily. Instead I put it here in case people get stuck, though it is quite a nice example of obfuscation itself, so it might not really be of much help :)

$i='1 '.join(' ',unpack('C'x length($ARGV[0]),$ARGV[0]))
;for (1..length($ARGV[0])){{$_=$i,s\.+? \\,split,($l,$i)
='';$i.=' '.($t=$_-$l),$l=$_ for(@_)}$i=~s/^ //,$o.=$i,
$o=~s\ .*\+\;}$_=$o,$_='1+'.join('+',reverse(split(/\++/
,$_))),s/\+-/-/g;print
[download]

Note: This script needs an argument, so either save it to a file and 'perl foo.pl "just another perl hacker"' or add an extra line at the beginning "$ARGV[0]='just another perl hacker';".