Free Management “Library”
Authenticity Consulting has a pretty capable resource http://www.managementhelp.org/ , that has good overviews of a number of areas in management. I don’t think “library” is the best descriptor. The site has a good number of high level overviews on a number of business related topics.
Wikiversity Section on MBA

Wikiversity has a great outline of the subjects you need expertise in to advance you MBA.
http://en.wikiversity.org/wiki/Topic:Master_of_Business_Administration
Open Learn Course Material On Business Management
The UK’s Open University has a good amount of course materials online related to business management.
http://openlearn.open.ac.uk/course/filter.php?grouping=topic&detail=4&order=date
Videos on Milton Friedman’s 1990 Series Free to Choose
IdeaChannel.tv has put up online Milton Friedman’s 1990 show Free to Choose. From the site
In honor of Milton Friedman, we are streaming the ground-breaking Free to Choose series as it originally aired in 1980 as well as an updated 1990 version. If you missed the PBS premiere of “The Power of Choice” it is available here.