Which speech has the most appeal?

As a professional speaker, I need to hone all my concepts down to a single 45-minute speech that I give repeatedly. I will probably profit the most from speaking to organizations. Many of you have heard a lot of my information, seen the videos, heard the CD, read the book and gotten coaching. What topic do you think has the most appeal?

If I had to repeat the same 45-minute speech to thousands of organizations, what topic would have the most appeal to those HR reps and the heads of those Associations?

Some examples might include:
Teamwork,
How to Get along with Peers,
Love as a Skill,
How to Find True Love,
How to Improve your Marriage,
Learn your Co-workers Language,
Learn to Listen to your Co-workers,
The Skills of Listening and Loving your Co-Workers,
How to Love your Job,
How to Appreciate your Peers,
How to Communicate Better with your Peers,
or anything else!

Please let me know what you think will be useful and interesting! Answer in your comments below. Thanks!!!!