There's also the PMI Project Management certification that you should look into.
I don't know a lot about it except that it covers project management methodologies and processes and paperwork, etc, etc...
Apparently it's a good one to get for a project manager. It's a long and difficult process, there's several exams and projects that have to be done. And it's not cheap apparently.
A few former co-workers got that certification (with the company paying for it) and moved on to greener pastures within 2 or 3 months of getting it. It took them over a year, because you have to do so many project management hours in your job, so its pretty much required that you're already a PM at a company.