Adobe silently released Reader X, for now only for Windows. It can be downloaded from:
http://www.adobe.com/go/EN_US-H-GET-READER
Installer for offline installation can be downloaded from.
ftp://ftp.adobe.com/pub/adobe/reader/win/10.x/10.0.0/en_US/
It allows saving PDF after adding comments or highlighting text. AFAIR, Reader 9 didn't offer that.
Regards,
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Vedran Miletić