eduventures.com has what looks like An Interesting Report on what the call eLibraries.
\"E-libraries are poised to become an important component of the e-learning industry, particularly in the higher education market. A major impetus for the e-library industry\'s growth is its acceptance by publishers and other content providers. Virtually every major publisher - including Pearson, McGraw Hill, and Houghton Mifflin - has signed agreements to distribute works via e-libraries.
The six leading e-library firms profiled in the report are Questia, XanEdu, ebrary, Britannica.com, Jones e-global Library, and NetLibrary. Within the next year, e-library businesses will seek to prove the merits of their business models by gaining market acceptance. However, the long-term success factors for e-libraries will be content, channels to end-users, and connection to curriculum.\"
You Download a free overview of the report Here, it\'s a PDF. The full report is not free, you can only read the overview for free.