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I'm expecting, one day, for half the moon to be covered in antenna gear and us using it as one large phased array software-defined radio. Like arecibo observatory, but HUGE.

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That may be closer than your think (except for the moon bit, space is hard). See LOFAR: http://www.lofar.org/about-lofar/about-lofar "LOFAR is the first telescope of this new sort, using an array of simple omni-directional antennas instead of mechanical signal processing with a dish antenna. The electronic signals from the antennas are digitised, transported to a central digital processor, and combined in software to emulate a conventional antenna. "

There are quite a few sensor networks out there at the moment:

PressureNet: Android barometer sensors ADS-B for flight data AIS for ship traffic CORS for precise GPS positioning data

It would not be out of the realm of possibility to have ~$500 software defined radios across the world with network connections, all funneling back to a data processing facility.

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