I wrote a short piece for Hyvinvointikatsaus (a magazine of Statistics Finland) where I summarise some of the developments in various sorts of online gaming; you can access this piece from:
http://www.uta.fi/~frans.mayra/Mayra_verkkopelaamisen_muodonmuutos.pdf
and the magazine home page is:
http://www.stat.fi/tup/hyvinvointikatsaus/
frans goes blog 