Part of this growth is a carry over of 2008. GDP growth rates are actually averages, more like comparing July GDP with July of the year before. So the growth in August to December should influence 2009 growth by say 1,5%, even if GDP remains flat in 2009.
So beware of all growth numbers published in 2009. In Brazil's case, this means at least a 2% real growth in 2009, eliminating carry over effects.