Sometimes you want to meausre how much you've contributed to Drupal.

Sometimes you want to measure someone else - perhaps you're considering hiring this person.

Try the following Google search (where "username" is the person's Drupal.org username):

That's it. Not scientific or anything, but it'll let you get a handle on how often a person's username appears on http://cvs.drupal.org.

Here's me for instance.