What we did last time was somebody with Skype called the mobile phone of someone at the gig, then the audio was streamed for the rest of us to listen to. But as ramblin rose mentioned, the sound quality isn't the best ... I tend to think it sounds like U2 are playing at the other end of a wind tunnel, underwater. But with advances in technology over the last four years, we might be able to pull off something better. Possibly even live video. Last tour, gorman sent me some video at shows he saw that I posted online within 20 minutes of U2 performing the song.
Personally, for most bands, I tend to avoid following their sets if they are coming to Australia, as I enjoy the surprise at the concert, but my obligations to U2gigs.com mean that my decision to follow the parties is made for me even if U2 are coming here. Speaking of which, I'll be posting the live setlists on the U2gigs.com main page, so even if the posting's thick and fast in the party threads, the setlist will be easily accessible there. I did that for a few shows last tour, but in retrospect, not as much as I should've.