I can weigh in a bit.
If you bought the PM Prepcast package there's module 00.3 you can watch that is about earning PDUs after you pass.
At the top of this page is a link to earn 37 PDU at a cost.
Other free areas is on PMI.org -- They have (almost daily) webinars you can participate in to earn PDUs. Once you sit on them, they can somehow validate you sat on the webinars and credit your PMI account with them. I've sat on a few for learning purposes. I don't think that they count for me as I haven't passed the test yet. For you, I'm sure they will.
They also have a whole page on how to get them:
www.pmi.org/Certification/Ways-to-Earn-PDUs.aspx
Congrats! I take my test next Thursday! Back to studying for me!
Scott Gillard