I can sit in a club and decide I want to go home. I can pull out my mobile phone from my pocket, visit a certain website and book a taxi home. I receive a text message when my taxi is near, then stand outside and hop in. This clever use of basic-for-2009 technologies impresses me somewhat. This is what technology should be about!
It may cost a bit more than trying to hail a black cab, but I really appreciate the freedom of paying a couple of quid more for a near-enough chauffeur service. And of course, it avoids having to take a night bus.