Karl, thanks for all of this, and for writing and posting your blog entry (words of caution for many).
my thoughts on your project are something like this: - i think non-emacs tools to deal with org mode files is a Good Thing. - for me, the main motivation is to allow *me* to share an org mode file with someone -- say via a git repo -- and have them be able to do something reasonable, if restricted, with it -- extract the code, query subtrees or tables, etc. -- without recourse to emacs. - i think collaborative editing with non-emacs users should be not be a goal of *this* endeavor. - for me, your main invention, and the place (non pro-versus-con) discussion should focus, is on your levels: what's at level 1, at what level is org-mode itself, etc. there are some tricky things here (e.g., for tables, what to do with hlines, with column width specifications, at the various "conformance levels"?) - and, sigh, i prefer some other name; like "org mode syntax (level 0)". maybe it will acronymize into omsl0 (gasp!). who knows. i do think "orgdown" was a clever choice, but i'm not a fan. cheers, Greg