I asked a manager and she answered!
Ask A Manager's "deathbed advice" features the 5 final things she would say to managers.
And yes, I did say in the challenge: "Imagine, you're an HR professional and you will die soon". But I never thought that so many people would take it literally ("last gasp", "somber organ music", "things I must tell you before I go", "deathbed").
I guess it's true, HR people have a wicked sense of humor...
And the list has been updated.
Correction (2 December 2007):
I always thought the wise one was a man. I was wrong and corrected the text above.