"Text can be searched automatically,
and cross-referenced using hyperlinks. This makes e-books an
excellent choice of format for works that benefit from search and
cross-reference capabilities, such as dictionaries, reference works,
and certain kinds of textbooks. Less physical space is
required to store e-books. Hundreds (or thousands) may be carried
together on one device. Approximately 500 average e-books can be
stored on one CD (equivalent to several shelves of print books).
Because they take up little space, e-books can be offered
indefinitely, with no 'out of print' date, allowing authors to
continue to earn royalties indefinitely (copyright law permitting)
and allowing readers to find older works." -- wikipedia.com.
You can promote whole websites effectively, mainly with ebooks.
Here's
a list with more information about online marketing with eBooks. Check it out.
