Last night, I went to see Sigur Rós at Somerset House, with hazyjayne, bluestate and masterkill. I ran into the Club AC30 people there as well.
Full review here (capsule summary: great set and lightshow, and the new songs sound good, and Amina Strings were as well). Photos here.
They were checking for cameras on the way in; I somehow managed to not get my PowerShot G2 noticed, though others weren't quite so lucky. Though there were plenty of people with small cameras inside; keeping punters from photographing gigs is only going to get harder.