Which would, weirdly, seem to imply that you can't use org-mode for literate programming in any language you have an Emacs mode for. But, you can, while still having your normal editor (at least for Emacs users), which is a big win over adopting and learning a special-purpose editor.
Link is: "A Multi-Language Computing Environment for Literate Programming and Reproducible Research" and it is basically an overview of org-mode for literate programming and paper writing.