The Speculist

Sure, it sounds like a cheesy skin flick from the 70's, but they're serious:

The colony aims to be self-sustaining in its requirements for sustenance, but it will nevertheless function in symbiosis with Earth. As a result, trade between the lunar colony and Earth will flourish, with the lunar colony contributing towards the development of research and scientific activities, such as, for example, the supply of alternative energy based on advancements in Helium3 fusion power, and provision of structural materials for spacecraft and satellites in earth orbit as well as deep space. At this time of potential fossil fuel shortages, threats of global warming, cultural clashes, and population explosion, this concept might well be what stops man's over-exploitation of Mother Earth by uniting governments and nations, scientists and laymen in mutual cooperation and understanding.

From reading the article, it sounds like they're stuck in a permanent planning stage. But maybe not.

This could make for some interesting discussion. In fact, let's make a poll out of it.

(via Rand Simberg)