?????????? Nielsen//NetRatings ??????? DoubleClick ?????,??????????????????????? 20%,???????? 75%,????? 31% ?????

???????????? IAB)? PwC ?????????????,???????????????????

IAB ? PwC ?????,???????????? 20% ? 72 ???,??????? 22 ???,??????? 38%?

???????????????????????,??????????????,??????????????????????????????????,??????????? 1.09 ???

???????,???????,?? Rich Media ?????????? 200% ??,????????????,?????? Rich Media??????????(The New York Times)

http://www.nytimes.com/2004/03/01/technology/01online.html?ex=1078808400&en=8048031d6ae84f22&