I don't like the balloons, they make a horribly loud noise which you can hear from miles away, quite intrusive, but on occasion they make nice photographic subjects. This taken in the Mara Reserve, Jan 2010.
40D; EF70-200mm @100mm; f4; 1/180; ISO400
It looks like it needs a slight rotation, but I think that is an illusion from the balloon which is moving forward.