Here's a useful combination: OA audio file of the spoken word + speech recognition software + search engine.
Two MIT researchers have made OA lectures much more useful by making them searchable. They've set up a prototype for searching audio lectures within the large collection at MIT's Open Courseware.
The open access movement:
Putting peer-reviewed scientific and scholarly literature
on the internet. Making it available free of charge and
free of most copyright and licensing restrictions.
Removing the barriers to serious research.
