I've used the lesson learned in our latest hires as well. Every resume could be better, so when we recently added two new members to our staff, I offered some feedback about their resumes, just to see how they responded (after all, we want feedback-loving people here).

It's so hard to give feedback if someone doesn't ask. That's why it really should be our job to ask for it as often as possible. It's probably the fastest path to self improvement possible.