Put up a nifty little diff tool based on Jamie Peabody's code that allows you to quickly review the differences between two files, presumably text-files, but works with most file-types.
First thing that comes to mind is that this would be a great Drupal 8 module with a bit of tweaking such as:
- Ability to pull in file contents via URL.
- Ability to batch process to look for changes to say, official Drupal Core versus what currently resides on your site.
One of the nice features of Jamies code is all of the work takes place in the browser which has obvious advantages including security.
Feel free to try it out and use it as well.