Mary Meeker's analysis 2011

An updated analysis for this year from Mary Meeker, again, and still very thorough.
KPCB Internet Trends (2011)

(Founder Stories) How Mike Walrath Built Right Media And Sold It For $850 Million

In 2009, when my company worked with Right Media exchange, it was already bought by Yahoo. Even at that time, an exchange was still a new idea to publishers.
The idea, still is to build a platform where advertisers and publishers; supply and demand can meet together to do business.

Thinking further, the business model is said to be a profitable one, from strategic point of view for online advertising. The valuation worths.