In the category: 'interesting numbers', I just ran across this info-bit on the Citrix website:
With industry analysts expecting the WAN optimization market to double to more than $1.2 billion by 2009(1), and an estimated 55 percent of all employees worldwide accessing their applications from branch offices, WAN optimization solutions are rapidly becoming a critical infrastructure requirement for enterprises around the world.
1) Gartner Dataquest: Forecast: Application Acceleration Equipment, Worldwide, 2005-2010, Aug. 10, 2006, Joe Skorupa.