Popular online forum or newsgroup for PDF developers

I just wonder if there are any popular online forum or newsgroup that is for developers who are interesting in PDF related controls, VCLs, OCXs, ActiveXs, as well as Acrobat SDK.
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Karl Heinz KremerConnect With a Mentor Commented:
There is the Adobe 'Acrobat SDK" user to user forum: http://www.adobeforums.com/cgi-bin/webx/.eed56a0/
In addition to that, the PlanetPDF.com forums have a developer area (http://forum.planetpdf.com/wb/default.asp).
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