Understanding Me is a chronological compilation of Marshall McLuhan lectures and interviews, with some context for each provided by the editors. As it's basically transcripts of oral remarks, it's very readable, and probably a good place to start McLuhan-wise. Funnily enough, one of the interviewers, Tom Snyder, actually says, "it was easier listening to you than it is reading you" (p. 255).
There is a lot of repetition, but rather than that being annoying, it serves to emphasize McLuhan's main themes and ideas. To update his remarks for the 21st century (he died in 1980), just substitute "internet" for "TV."