Stardust - lightning Steampunk airships

While Stardust, the film, may be out in the US, I must wait a little while longer before the airship of Captain Shakespeare can brave the skies of the Atlantic and bring it to the UK shores.  However, in the meantime, I can amuse myself with the background information about the antics of the air pirates, and what it is that they actually do.  They harvest lightning, for the black market (of course).  It’s a simply fantastic idea (literally), and the airship seems to have webs and vanes of metal attached to the sides to act as lightning rods to collect this powerful side-effect of nature which they store in a jar.  (Leyden, perhaps?) I’m still looking forward to this, and if anyone over the ocean has managed to catch this, please feel free to let me know in the comments what you felt of the film – though preferably with as few spoilers as possible.  Thank you!