Gitcritic does some of this right now as a webapp, including side-by-side diffs: http://gitcritic.com http://gitcritic.com https://github.com/danvk/better-pul

Gitcritic does some of this right now as a webapp, including side-by-side diffs: http://gitcritic.com http://gitcritic.com https://github.com/danvk/better-pull-requests https://github.com/danvk/better-pull-requests