I'm not sure you need any further certifications. Given your current credentials and years of experience, the only credentials that might possibly be of interest to you would be the CCP or possibly some of the Cisco security certs. But since you're already quite senior and knowledgeable, you should be able to get more job offers or consulting work than you can handle.
If you're having problems finding a full-time position on your own, any top-notch IT recruiter would be glad to work with somebody like you. If it's consulting work you're after, consider hooking up with a professional practice that specializes in security, or talk to the big consulting firms (EDS, Accenture, Perot Systems, IBM Global Services and so forth).
Good luck with your future efforts.
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This was first published in February 2002