With IE6, IE7, and IE8 totaled vs. FF2 + FF3, IE* is obviously in wider use.
Not that it isn't noteworthy.
Just offering a little more information.
That FF3 moved into first position partially due to IE7 users upgrading to IE8 indicates that as folks move to IE8, for at least a while FF7 will be in first place in raw numbers.
FF has a ways to go yet to be dominant over IE across the board.
Wonder where the IE6 crowd will go, in time?