Spaceballs Could Invade Mars

Byteme writes: "CNN reports giant tethered inflatable balls that are being developed by NASA as a potential alternative to the unsuccessful roving robots. The balls apparently will inflate and deflate to catch favorable wind directs and to stop on location. Not quite the fast, cheap and out-of-control solution... but it could be fun to watch!" I wonder if there are any MPEGs of the test this article talks about -- it sounds pretty fun to watch.