Next week is the sixth Open Access Week, the aim of which is to "help inspire wider participation in helping to make Open Access a new norm in scholarship and research".
Philosopher Peter Suber has had an enormous and critical "founding" influence on the Open Access movement. Above is an 80 minute recording of the recent launch of Peter Suber's outstanding MIT Press book "Open Access", chaired/mediated by David Weinberger, also a philosopher.
If you want a steady, convincing, personal and "discussive" account of why Open Access matters, and what motivates people to push for it, your time will be well spent. (Someone mentioned that Suber has past "form" as a comedian; and did I read that Weinberger has been a joke-writer? This somehow comes through in the discussion.)