Wind Ladder

It is advantageous to build wind farms vertically instead of spreading them out over land.

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Existing Systems:

http://en.wikipedia.org/wiki/Tethered_Aerostat_Radar_System

"The aerostats are large fabric envelopes filled with helium, and can rise up to an altitude of 15,000 feet (4,600 m) while tethered by a single cable. The largest lifts a 1000 kg payload to an operating altitude providing low-level, downward-looking radar coverage. The aerostats are stable in winds below 65 knots (120 km/h). "

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These people are building inflatable wind turbines for power generation.

http://www.magenn.com/

Here is a general description of airships:

http://en.wikipedia.org/wiki/Airship