Most of the guys and gals that I know that have gotten interviews have had someone walk their stuff in. There have been a few people that have not been well connected and not had their stuff walked in that got the call, but the Friends and Family thing has really worked.
I got three people calls yesterday. It lets them know that you have a pilot that is willing to bother you enough for you to spend your off time to come up and see him.
Just out of curiousity, from viewing your profile I would say that you are an ASA pilot, how did you get three people calls for Delta interviews? I agree that walking someone's stuff in makes an impression though.