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Except for the ones noted above, there is the Japanese installation page at
http://www.rinc.or.jp/~kotobuki/gem/index.htm

There is a Pd mailing list. Subscription info is on IEM's site http://www.iem.at/mailinglists/pd-list

One of pd's unofficial home-pages is at http://pd.iem.at hosted by the Institute of Electronic Music and Acoustics, Graz, Austria

Also hosted by the iem is the site of the pd-community http://www.puredata.info

An interesting place might also be Günter Geiger's size http://gige.epy.co.at/

there are lot's of other cool pages (search the net...)