A check-in policy to require a comment has always been a frequent request.  Jeff Atwood has posted a convenient installation package (.msi) for James Manning’s check-in policy to require a comment.

Installing the Check for Comments Check-In Policy

In a previous entry on adding a new check-in policy, I provided the source code for a comment policy. I re-packaged that source into an easy one-click installer:

• Download the Team System Check for Comments Policy installer (140kb)
• Download the Team System Check for Comments source code (11kb)