While looking around the Howard Hughes Medical Institute website, I came across a section called "Becoming A Scientist" in the Cool Science area. There are videos of eleven prominent biomedical researchers talking about what they think it takes to become a scientist. As you might expect, the answers are a diverse as the scientists themselves. I particularly like the advice that anyone can become a scientist, as long as they aren't afraid to give it a try.
Why was I poking around the site? Looking for the Free Science DVD's, of course. I ended up downloading the "Seeing, Hearing and Smelling the World" pdf instead.
Hope you find something useful as well.