Many students are juggling studies with work, personal issues, financial problems or raising a family. On top of all of that, some are just trying to fit in. When talking to students about succeeding on campus and post-college life, don't just give the routine theory of success. Use real life stories of failure and triumph and couple them with theories of success you've adopted. Every year C-Span.org features video of the most-inspiring commencement speeches of the year.
Political speeches are usually guaranteed to stir things up but stimulate conversation. Some students will agree with you and some will disagree. Still, it's an effective way to expose students to different ideas and teach them how to agree to disagree. Abortion, euthanasia and voting are some of the top talking points listed at best-speech-topics.com.
Some college kids may know a little bit more about sex and relationships than they did in college, but there's still a lot more to learn. Try discussing how relationships become more complex as people age, tying in subjects such as HIV/AIDS, abortion, self-esteem, homosexuality, domestic violence and dating. For speakers in the science field, consider talking about dating and the biological differences between males and females.