Link: http://en.wikipedia.org/wiki/Lunar_space_elevator
Lunar Elevator can be built today using commercial Zylon fiber.
Lunar Elevator gives cheap access to lunar materials, feedstock for space industries. We can extract oxygen for space tugs delivered to LEO.
Click here for Wikipedia article
We can build large structures in space, from lunar materials e.g. solar power satellites and space habitats. We could also soft-land heavy equipment on to the Moon. Have you read the High Frontier by Gerard O’Neill ?