One of our favourite bits of kit from Star Trek is the replicator. You simply walk up to it and announce, "Tea, Earl Grey, hot" or, "Stripper, Puerto Rican, hot" and it conjures your wish out of the air and delivers it to you. If that sounds like your cup of tea -- hot -- then head to Blackwell book shop on London's Charing Cross Road for the Espresso Book Machine, which prints whole books while you wait.