http://backtalk.sourceforge.net/> Incidentally, I have sent an email to Chris McDonough a few weeks back about a partial mod of backtalk I have done that uses ReStructuredText (http://docutils.sourceforge.net/) instead of the Zope StructuredText (which has lots of problems IMO). Chris did acknowledge my email but never got back to me, and I haven't worked on it since then either, but if someone is interested, let me know and I'll post what I did so far somewhere.
Yikes, yes, sorry.... I apologize for not getting back to you! Do you think you would be interested in creating a "modal" BackTalk where you could switch between restructuredtext and classic stx? If so, I would be happy to give you contributor access to the sourceforge project. We have a lot of documents in BackTalk that depend on the (mis?)-features of classic stx, so to replace the classic-stx-based implementation with a restructuredtext implementation wholesale is less than desirable, but I have no problem giving people the choice on a per-book or per-document basis whether they'd like to use stx or re-stx. Thanks again, - C