Today Tix is a website and application based theatre ticket company. Basically you can get last minute tickets for shows at discount prices in a variety of cities including: New York, London, Los Angeles, Chicago, and more.
They have made it streamlined and user friendly. The options are usually listed for shows up to a 30 days in advance.
It elimiates the need to run to the box office, or TKTS. Especially convenient if you are out of town and traveling into town.
Another example of technology moving things forward, this time for us theatre nerds.