Shh! We don’t want to jinx things, but apparently the O2 is set to become the busiest and bestest venue in the world. (Well, bestest is perhaps subject to opinion: the Shepherd’s Bush Empire is pretty hard to beat if you ask us.) Anyway, all things being equal, by the end of 2007 its ticket sales will have exceeded those of Madison Square Gardens for the whole year, even though our pet bubble only opened......