Some of Steve Yegge's posts talk about a customer service app written in C and emacs lisp. I'd love to know more about it but I haven't been able to find any details apart from those in Yegge's posts. It was written by 'Shel Kaphan'. See this post for example :
https://sites.google.com/site/steveyegge2/tour-de-babelI see that skaphan is a user on here too :)