yes, i agree about Bono's improvisations, mostly they are very inspiring and make songs that are already great even greater.
still, the "rap" during The Fly is not exactly a goose bumps moment (according to Pimm's book, even the crew had trouble this night, flashing The Fly's text messages during Zoo Station), but i agree about the improv in Still Haven't Found at this show is cool, you can hear Bono's making it up as he goes along.
also, the snippet of Van Morrison's Irish Heartbeat in Bad before All I Want Is You, is always a nice addition. very heartfelt lyrics: "oh won't you stay, with your own ones/don't have to stray from own ones"
"What surprised me was that Larry went with it. I was waiting for the eyes to roll. But they didn’t. I mean, most of the time, it’s hard enough to get Larry to come over to the south side of Dublin."
- Bono on recording No Line On The Horizon in Morocco