We don’t want iPads to just become replacements for notebooks and textbooks, we want them to be objects to think with. We want students using them to mess around with the world around them and their courses of study.
"There are many pdf annotation apps available that allow this kind of text marking, but another killer feature that is somehow less celebrated: voice annotation.
The video below walks users through adding voice comments to pdf documents, starting right at the 2:00 mark. (The first two minutes cover the aforementioned text annotation.) Being able to add voice comments not only allows teachers to clarify important ideas, but could also be used by peers during the revision portion of the writing process.
As the paperless classroom becomes easier to realize, new tools will become more and more necessary to fill in the workflow gaps. Tools like these are a step in that direction."