Sourceforge has it and I wanted to have it too: context diffs in CVS commit emails.
Sure, it sounds nice and useful. Every time you commit something to your CVS repository, you and your team members get an email from the repository that not only includes your commit message, but also includes a complete diff for all your changes.
Here's why you shouldn't try: Because all the scripts that promise to deliver those diffs will give you noting but trouble.
I have no trouble with scripts that are no longer maintained and no longer fit to the current versions of CVS. But all those scripts are also lousily documented. After you performed those "4 easy steps", you never have a running system. Heck. You might even end up with a repository that won't let you commit anything ever again.