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.