You can do it with Foxit or A.nnotate
Posted Jun 5, 2008 21:47 UTC (Thu) by edinburcc
In reply to: Free means to annotate (comment) a PDF?
Parent article: The Grumpy Editor's Guide to PDF Viewers
For a downloadable program, there is Foxit Reader or you can do it via the browser at A.nnotate.com where you just upload the file and start adding comments.
Both have free and commercial versions, but I'm not sure of the details.
to post comments)