iBooks love: free e-books worth reading
"The National Association of Scholars just published a list of brain-challenging books that they recommend for college reading programs, but which should be of interest to any passionate adult-level reader. These books were selected for presenting important, well-argued ideas with a level of complexity that stretches the mind ...."
This is mainly for the general public and promoting some good books. I'm sure that MR has most, if not all, of these books.