Reply to Nick,
I'm working on a high-level-language processing tool as a pet project (at the moment it just parses grammars compiled with the GOLD tool), and (especially for debugging) I'd like to output the parse tree and eventually AST in a way that I can easily/visually inspect the resulting trees.
Our stuff would be a little weak on the rendering side (it's extensable enought to fix that but it would involve a little work)
Take a look at YAML if it looks like it might be intereting to you our stuff might as well. If you're intereted send my your email.
