In order to keep you better informed regarding latest PDFNet SDK releases and announcements we created a new email list: https://groups.google.com/d/forum/pdfnet-sdk-announce
You can join the group and received email notifications without other PDFNet KB related noise.
Alternatively you can subscribe to the following RSS feeds:
http://groups.google.com/group/pdfnet-sdk-announce/feed/rss_v2_0_topics.xml
http://groups.google.com/group/pdfnet-sdk-announce/feed/atom_v1_0_topics.xml