Once tours/interviews were set up, our DS sent an email to the music teacher at each school, with a link to a youtube video of him playing. (The video was filmed for a masterclass audition he was already doing, so it was a good quality video, with a professional accompanist.) He let the music teacher know the date/time he would be on campus, and asked if he could stop by and meet him/her while he was at their school. He brought a DVD to each interview, and gave it to his interviewer, and also asked during his interviews if they would like an email with a link - which they all did.
I think that easy access to information/materials that give the admissions committee a good idea of an applicant's strengths is always helpful. And being able to easily access a link from a computer - or forward that link to someone else - can be much more conducive to sharing info with multiple people than passing around a DVD.
If you're not comfortable with youtube, VIMEO is another good video-sharing site, that is free for "casual" users. (They have a paid service also.)