stretch mapping

Has anyone used it and are there any good tutorials?

Do you have any explanation of what it is or do you have a picture where stretch mapping are used or anything?

I believe that McSmiffy used it for one element in his winning entry for Animation Challenge #35.

<insert plug here>
Animation Challenge #36 could still do with some more entries, so take a look now.
</end plug>


Oops its stress, not stretch.