Usability expert Jakob Nielsen at the Nielsen Norman Group published an article on the usability of PDFs on the web: Avoid PDF for On-Screen Reading.
Avoid PDF for On-Screen ReadingSummary: Forcing users to browse PDF files causes frustration and slow task completion, compared to standard webpages. Use PDF only for documents that users will print. In those cases, following 10 basic guidelines will minimize usability problems.
So what do other Canvas users think about the usability of PDFs in courses?