Hello Carl,
Before answering your question on wooing the interviewers, here is something you should know. PMP certification is a measure of your PM abilities and continuously improving your skills and project management knowledge. It is a wrong perception to think that you do not get PM experience without PMP certification.
Just to let you know I am a Sr Project Manger managing multiple software development teams. Even though I was working as a PM for past 6 years, I took the PMP Certification exam, just last year and got my PMP. As far as your interviews go in you job search as Project manger read some of the Project Management article and books advices by PMI. You can build confidence on how to associate you current work with the processes and terminology being used in PMI/PMP professionals.
Here are some URLs to get to some of the questions a SW Project Management professionals can face in their interview:
http://projectmanagement.ittoolbox.com/documents/popular-q-and-a/project-manager-interview-questions-785
http://discuss.fogcreek.com/joelonsoftware/default.asp?cmd=show&ixPost=146790
http://groups.google.com/group/prg.jobs/browse_thread/thread/7ead9e9fb3b9bc58/3d9c35797dbb712b?lnk=st&q=software+project+manager+related+interview+questions&rnum=2&hl=en#3d9c35797dbb712b
Hope this will help you.
All the best in you search and endeavour.
Jags Pannala PMP.
Carl:
You might also cehck out interviewing on Gantthead.com. they have some pretty good advice. What you want to focus on in the interview is how you ensure quality in the product you; how well you can manage stakeholders and risk; and how you have been able to deliver things on time. You said that you have management experience, so you should be able to speak to how you motivate employees to get a job done. The real difference is the time constraint that a PM operates under. how well can you plan and manage your time to meet the plan.
Best of luck to you,
Jim Muller, PMP
Carl, what a pleasure to help as much as I can. How about you emphasize how much money you've saved your companies by implementing PM practices. Could you woo them with the prospect of knowing a project is heading downhill and knowing how to save it due to your "vision" with PM? Just some ideas that would get my attention.
Wishing you the best! -Tresia Eaves, PMP