Toward the end, Bono asked everyone to hold up their mobiles in the air to make a 'Christmas tree'. The result -- not really done justice here with this cameraphone shot -- was amazing. Afterwards, he asked us to text the word 'Africa' to a special number for some petition. (A footnote: I got a text from "Bono" this morning, thanking me for attending the gig and for showing an interest in "making poverty history". Me and 81,000 others, probably.)