Your best source of ammunition is on Certification Magazine's Web site. You should be able to find recent, salary and employment surveys that indicate a positive correlation between technical certification and employment prospects as well as pay. I'd also urge you to clip hard-copy classified ads that mention certification requirements, and to build yourself a collection of online job postings that do the same. You should be able to make a pretty compelling case with this kind of information to bolster your contentions.
Editor's note: SearchWin2000.com also has a salary survey that you can use to compare salaries with certs and salaries without certs.
This was first published in December 2002