For travellers who want to plan their trips in advance & have limited time, booking tickets online and skipping the queue has been a great way to maximise the time actually spent inside the museums, particularly those such as the Vatican Museum that are prone to lengthy queues. Greece has now announced that a similar service will be available for many of their archaeological sites. This is great news, although the benefits are probably not as great as somewhere like Rome, as in my experience, the queues to actually get into sites such as the Acropolis have never been as problematic as they are in some countries.
Greek Reporter 
E-tickets for Greek Museums, Archaeological Sites
By Christina Flora on November 3, 2012 in News
The Greek Ministry of Education and Religious Affairs, Culture and Sports has begun a special ticket issuing program for museums and archaeological sites using computers and mobile phones.
The e-ticket program is going to operate within the next few months and will include 30 frequent visited museums and archaeological sites such as Acropolis, Delphi, Ancient Olympia and the National Archaeological Museum of Athens. Visitors will be able to get their ticket with a single click on the link which is going to be created soon.
The Digi Tickets Ticketing System for Museums provides a modular suite of online ticketing services which meet specific business needs and enable ticket sales to be generated through the Internet and fulfilled via multiple on-site ticket redemption options. When visiting the sites or museums, visitors will not have to wait in the queue but only use the electronic reading machine to enter. This improves visitor flow through entry points during busy periods as it reduces time spent at a manned desk requiring payment.