Used it this morning at Shanghai Pudong airport. Internet check in is not for nothing anymore. After printing out your boarding pass on your home printer, at least Singapore airlines has a separate 2 check in counters for internet check-in and they serve first internet check-in customers first and then normal customers. The beauty of this is that almost no one was using internet check-in this morning. The normal queue was 50 persons long, while i just strut to the front of the internet line to deposit my bag! Don't remember this trick being of too much help in europe where its common to do kiosk check-in anyway.