Commenting on PDFs in Google Drive

You can now add comments to a PDF (that you own or have editing rights to)  stored in Google Drive.
Here's a one-minute "how-to" video.

Printing all docs in a Google Drive folder

Several classes recently did a project where they needed to print posters that were saved in Google Drive.  The teacher created a shared folder for the posters.  The question now was how to print all the docs without individually opening each one.

Here are instructions for doing this with Adobe Acrobat Pro.