I found out today that the ACM, IEEE Computer Society and AIS have gathered a bunch of career information for high school students. They have a web site (http://computingcareers.acm.org/) and a brochure that can be downloaded in PDF format.
From the announcement:
A new brochure is available to counter the many misperceptions circulating among high school students, their parents, and teachers about computing careers. "Computing Degrees and Careers," prepared by ACM, the IEEE Computer Society, and the Association for Information Systems (AIS) aims to provide more accurate information on what computing is and the career opportunities it offers.
The web site has a bunch of useful looking links that explain different computing careers, what people in those careers do and a top 10 list of why students should major in computing. I think that the brochure might be a good thing to reproduce and had out before course selection time. And if you have a printer that can make larger printouts it should make a colorful and interesting classroom poster as well.