even I got stuck at the same leet speak stage.
I edited the source code of unrar ( the decrypting utility for rar files on linux)
I used the concept of piping and interprocess communication to create a rar cracker with all permutations of the leet speak password.
The only problem was that my code would have taken 302 DAYS for cracking it
any ways .. I got to learn inter process communication as a side effect
didn't get time to pick digit up since then.