Here is a short but interesting article to read: Real Life in the Virtual Library, The Charleston Advisor, Volume 10, Number 1, July 2008 , pp. 47-48(2).
Headings include the following:
Why Create a Virtual Library?
What Is a Virtual Library?
What Does a Virtual Librarian Do?
What Does the Future Hold?
The article was written by Jannette L. Finch, librarian for the College of Charleston North Campus and Lowcountry Graduate Center in Charleston, South Carolina.