more info at:
http://www.oreillynet.com/pub/wlg/6599
(includes a link to the home page (in Japanese) and a google translation of it)

The odd think is that I didn't see anything about Ruby.  :(

-- 
thanks,
-pate
-------------------------
ParseTree is a little brown stinky ferret that digs down a hole and
violently rips the AST away from the warm bosom of ruby. In other
words, we cheat, they don't.