The folks at Skyacht have successfully performed a tethered test flight of their hot-air blimp:
In addition to recreational uses, the Personal Blimp can fly in ways that no other aircraft can match. For instance, no other aircraft can accomplish the seemingly straightforward task of picking off the top-most leaf from a particular tree (Helicopter downblast tosses the leaves wildly; Helium airships can't hover; Previously built hot air airship and and hot air balloons are nearly impossible to steer precisely.) In contrast, the Personal Blimp flies "low, slow, and smooth." This enables one to accomplish tasks as simple as the above-mentioned picking of leaves off the tops of trees or as complex as carrying airborne gravimetric measurement equipment (used in diamond prospecting) with far greater sensitivity and spatial resolution. Other areas of application for the Personal Blimp's unique abilities include forest canopy research, wetlands survey/management, eco-tourism and aerial photography.
When not in use, the Personal Blimp can be deflated and folded for storage (much like a hot air balloon.) The combination of ready buoyancy control and rapid deflation eliminates not only costly hangers but also the large ground crews typically required for helium airships.