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The PD Mailing list is the main discussion board of PD developers and users.
It is mainly used to discuss tecnical issues.

It is up since 1998 and at http://lists.puredata.info
you can access all of the archives

(ah yes, this is little known:
you can download the whole archives as http://iem.kug.ac.at/mailinglists/pd-list.tgz or http://iem.kug.ac.at/mailinglists/pd-list.zip for easy offline-reading)