If you are talking about tracking in Google Analytics, the easiest way I have found is to create custom URL’s for all outbound links using the Analytics URL Builder.

http://support.google.com/analytics/b…

I always make the source: Landing Page and then the Campaign name whatever group my landing page is in (or whatever will help you recognize it). Make the medium whatever you want to track (for example, mine are PPC)

The links then show in analytics and are really easy to track.

I ended up using Events in GA, but expected Unbounce to track the clicks just like it tracks and stores leads