1. Do a retro tour - have only artists older than 40 open for them (Sting, Bruce, Petty, Elvis, PJ, REM... - old guys rule!).
2. Slogan: The New U2 - Less Talk, More Rock
3. More mix in setlists, maybe in encores - do poll on u2.com for input from fans.
4. Many more contests and give-aways on u2.com during tour.
5. Offer a CD off soundboard and/or DVD of each concert ala PJ bootlegs on their fan site.
6. Do something about GA so more people can experience it without all the line drama. Someone on here suggested that the ticket be printed with an album name and number. Fans would get there before the concert to get in groups by album and lined up by their ticket number. The albums would be randomly selected to see which group is 1st, 2nd, 3rd, etc to be let in. This would prevent the need to camp out and should also discourage scalping since you would not know ahead of time if you would be up front. [OR some system along these lines]
7. Bring back the Dalton Brothers for a few shows!