An email is then sent to the person’s LinkedIn inbox notifying her of your endorsement. The Skills and Expertise section contains the faces of your connections that gave you an endorsement.
Now may be a good time to update the Skills and Expertise section of your profile.
During my test of this feature it worked only intermittently. LinkedIn seems to be working out the bugs, but Endorsements is a great new way to quickly give props to the people you value in your professional network.