"Being inclined towards crazy stunt performances, I'm planning on writing 'Halting State' on my mobile phone. This is technologically feasible because the phone in question has more memory and online storage than every mainframe in North America in 1972 (and about the same amount of raw processing power as a 1977-vintage Cray-1 supercomputer). It's a zeitgeist thing: I need to get into the right frame of mind, and I need to use a mobile phone for the same reason Neal Stephenson used a fountain pen when he wrote the Baroque cycle."
As I just mentioned to a close friend, not one of Charlie Stross' books has failed to break my head open and induce at least one thousand-yard-stare "Oh. My. GOD." moment.