For a scholarly analysis of the "jumbled spelling" urban legend which has been floating around the net for a few years, see this article on jumbled spelling from a Cambridge linguist which also includes a few other scripts which do similar things to yours. The issue has come up here at PerlMonks before and there were a few other scripts posted. I tried some searches but wasn't able to find it.

update Ah, found it. (The previous PM posting on a jumbled spelling generator).