Here's a recording on redacting information in PDFs using Acrobat: http://emergent.na3.acrobat.com/p45882300/
This webinar was for DHS (Department of Homeland Security) and sponsored by Emergent: http://www.emergent360.com/vendor/adobe/ and Adobe: http://www.adobe.com . It was great to have the opportunity to dig into the weeds of one important aspect of Acrobat and help DHS.