I'm not sure about the protocol here, and it may be perceived as bad form to start your blog with a plug, but here goes anyway. While the pause button is still engaged on U2's 360º Tour, you can always check out Squaring the Circle:Creating U2360º, a documentary on the show's conception and realisation which I directed. It's on the bonus disc of U2's new live at the Rose Bowl dvd released earlier this month.
It documents the whole thinking behind the extraordinary 360º production from Bono's initial architectural modelling with forks through to opening night in Camp Nou, Barcelona in June '09 - and the band's reaction to the Tour at the end of the first leg.
The bonus material also includes a pretty cool timelapse sequence (even if I say so myself) of the U2360º spaceship coming to land in Berlin's Olympiastadion (and a little bit of Barca). Both were produced by Ned O'Hanlon.