Thse are websites from Google research. They explain l337 languages properties and how to translate it.

http://www.review.udel.edu/archive/2...on=3&article=9

http://www.cscentral.com/features/l33t/

http://www.planetquake.com/turkey/l33t.htm

First site say "Remember, l33t speak is not a consistent language. Usage varies drastically from user to user." but I dont see how "4" could be used as "S". And the others are interesting.
On topic I prefer owned over pwned.