The obligatory chart:

Characteristics unique to written or printed text
(and in a paper context)
Characteristics common to both Characteristics unique to electronic texts
(and in an electronic context)
Permanent: it stays the same unless consciously and deliberately altered Basically linear; one dimensional (one thing after another, left to right) It flows; can be tracelessly edited or moved
The technology for producing and distributing it is complex and expensive How you understand depends on what you bring to the text You can't take it to bed with you, or read it in the bathroom
Reading tends to be a leisurely exper- ience, to take substantial chunks of time It's easy to distribute to others, to communicate at a distance Reading tends to happen in small chunks, a screenful at a time