Hi Lisa,
I've put together a few thoughts which I hope will be of use to you in your presentation this Saturday, or at least interesting to read if you are unable to make use of them:
As with many people, my adolescence was marked by a passionate search for meaning in life. Taking your philosophy class during this time helped me greatly in confronting many of the questions of myself and the world around me to which I was becoming aware for the first time. It's difficult to separate the lessons of your class from the lessons of my general life experiences, because they both produce a common result -- wisdom -- and it is easy to view the study of philosophy as simply a more formal means of acquiring wisdom. This may also explain why my interest in studying philosophy declined steadily over the years since you first exposed me to it -- after a certain point, I was content to negotiate the fundamental questions of life hands-on rather than search through books and essays for the answers to them.
What I found most important about philosophy was not that it could offer answers to these questions (which so often boil down to opinion and personal preference), but that it could train me to approach the questions objectively and from a more universal point of view. This approach is especially rewarding when coping with the emotional challenges of everyday life -- for example, waking up on a Monday morning after three hours of sleep and considering a week of undesirable work that lies ahead. Rather than be a victim to negative emotions at a time like this, I can often find humor in its insignificance when I compare it to the full timeline of my life or that of the cosmos. The "Outer Self" I become at such moments tends to look upon my present troubles with a look of disdain and ask, "Why on Earth are you so bothered by that?"
There is even an opportunity to turn such moments into "data points" that shed light on the fundamental questions one confronts through philosophy -- "How do the difficulties of my job reflect on my current views of labor law?" To sublimate such moments of challenge in the way I describe requires, I think, a level of personal maturity that philosophy is unique among academic subjects in its ability to cultivate.
One other brief observation regarding your class specifically: because of its discussion-intensive format, I found myself having meaningful and sometimes deeply personal conversations with fellow students to whom I would have never otherwise spoken outside of class. Once again, philosophy seems uniquely capable above other classes in bringing about this bonding opportunity among students, because it offers a chance for discussion that is both personal and academically relevant at the same time.