Consumerism Commentary, a blog on personal finances, did a twitter poll asking if people work in the same field as their degrees.
The answer is interesting...read it here. As for me, I started out in environmental engineering (wat/san)...wasn't sure it was for me and spent three years doing everything but, then had an epiphany and came back to it. Essentially, the path isn't clear, people. You can do whatever you want, and how lucky are you to be able to do that!!