There are tools like Phabricator (http://phabricator.org/ http://phabricator.org/) that extract your diff and store it in a database, providing a web frontend t

There are tools like Phabricator (http://phabricator.org/ http://phabricator.org/) that extract your diff and store it in a database, providing a web frontend that allows others to add inline comments and suggestions independent from the underlying revision control system. We use a version of this at Facebook for required pre-commit review, and I've found it to be quite nice. Check out e.g. https://secure.phabricator.com/D583 https://secure.phabricator.com/D583 for an example of a diff for phabricator itself that has some inline comments and other input.