Some links (Some interesting stuff I found):

Real World Mathematics

Why study calculus? a brief history of math

How will calculus be applied in my career (geology)? - Yahoo! Answers

Math Forum - Ask Dr. Math

The last link seems to provide the best information.

And a little background in my own life. I find that calculus comes in very handy in a computer science career. Many a time I apply calculus to algorithms for programs that write. You use more calculus than you know. Also, there is a lot of applicable calculus in an economic career too.

If you want some more answers try google searching.