The Massachusetts Bay Transportation Authority (MBTA) and Masabi have joined forces to bring a rail ticketing to handheld devices via iPhone, Android and BlackBerry apps. Headquartered in London, Masabi has launched similar tech for transit companies in the UK, eliminating ticket lines for many smartphone-wielding passengers. Software will allow riders to purchase tickets and passes that are validated with a barcode scan by conductors equipped with mobile devices of their own.
Using T employees to scan the codes seems a little silly, but hopefully that's just an interim measure while they install scanners on faregates. I hope to see something like this in DC soon!