moTi - 9:20 pm on Nov 25, 2012 (gmt 0)
but it has done better than the 300 x 250 that used to be in those spaces has typically done
300x600 compared to 300x250 = 2.4 times more screen real estate, which is a scarce resource. if content quality and user experience means something to you, you should demand considerably more yield for that space. simple as that.