I am looking to start an online business, and I am in need of some
market research.  I have a multi part question:

I would like information on fastest and most profitable growing trends
in the online business sector. Are there any emarging markets that
should be noted?  Some ideas of interest are: Financial information
sites, real estate listing service, or selling a product or service in
general. I would also like to have examples of new innovative websites
that profit purely from revenue being generated from a service they
provide or from advertising. (ie, Ebay.com or www.loopnet.com)

The internet market is not saturated. Normal retailing has been around
for a century or more and still has opportunities for businesses.
Likewise with the Internet. They said it was saturated when
friendsreunited came along.