PDUs for maintaining PMP credentials

For me, my best are:
1- PMI Webinars.
2- Working as a practitioner within the profession.
3- Self learning through reading PMI publications.
4- Voluntary work with the PMI CoP(Community of Practice)


Good link from Intel:

"How to Progressively Obtain PDU’s For Your Maintaining Your PMP Credential" by Jeff Hodgkinson

http://communities.intel.com/community/openportit/blog/2012/02/13/how-to-progressively-obtain-pdu-s-for-your-maintaining-your-pmp-credential