Mary,
I would fight as hard as possible, if I were you, to get a job first and not go to additional education, another postdoc, etc. Really, there comes a time where people just have to say "I've had enough" and put 200% effort into the finding of a job. The economy has, after years, finally picked up steam and jobs are out there. That's not to say that there aren't still too many of certain scientists in the market, but like everything else, the "early bird gets the worm" or the "squeaky wheel gets the grease," or whatever tired phrase you want to use to describe the fact that the most active job seekers seem to succeed.
There's an article about this track in Tooling Up that you ought to read, because the interview was with a person like you and she talks about how she got into regulatory. It was about 2 years ago -- still current enough to be of interest (
http://sciencecareers.sciencemag.org/career_magazine/previous_issues/articles/2009_09_18/caredit.a0900112).
The RAC certification is great, but all you need to do is to be "in process", training for it, and you'll stand head and shoulders about everyone else who is applying for those entry level Regulatory jobs. Or, you might have to take a job in a technical staff doing work for the regulatory submittals, and then move over sideways to the RA group once you've had some company experience. That's always a particularly good path. The biggest fear you will find by employers will be the "can this person think beyond academia" concern that companies have. So many people with advanced life sciences degrees from academia often know nothing about the world of business, and it "shows" in their interviews and in the approach they take to finding a job. Just break that cycle if you can. Read about regulatory, go to a few events or networking meetings for RA staff, stay in touch with the RAPS website, and so on. Just by building your network around that interest, you'll hear of entry level jobs.
Don't forget the world of regulatory consultants. There are a LOT of RA consulting outfits, some of them are one-person operations. Even a sole operator who has a good list of RA clients can use help and that's an excellent training ground. Even if you were to go in with only a 10-20% increase in salary from your postdoc (a real bargain for that consultant employer) it would be worth it because after a year or so you'd have great experience.
Come back and let us know how you did.
Dave Jensen, Moderator