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Zeppelins Over California
It seems that Sky Captain and the World of Tomorrow may not have been completely off the mark. According to Venture Beat, Airship Ventures has raised capital sufficient to build their first Zeppelin NT (Microsoft Windows reference purely coincidental). The airship will offer rides for up to 12 passengers out of the old Navy Blimp hangars at Moffett Field in Silicon Valley. Airship Ventures notes that airships are already flying safely in Japan and Germany, so now the US will have its chance. Rides will cost from $250 to $500 per person. Esther Dyson is one of the investors.
As much as I get the joke, hydrogen as a lifting gas for airships is something whose danger is by far and away overblown. Germany used airships extensively using hydrogen... and it was the fact that they used what was effectively rocket fuel for the ship hull that did in airships like the Hindenburg, not the hydrogen gas.
Assuming that these airships are going to use some petrochemical substance like gasoline or JP-5 (military-grade jet fuel) to power its engines, I would be by far and away more concerned about some problem with the fuel system blowing up than the hydrogen.
As for why a 1930's technology isn't being used in the 21st century more extensively, there are a bunch of factors in that equation... including some irrational fear of hydrogen that makes it the target of lame jokes like this one.
Helium is a HUGE expense when you're filling the ship from the start, but in normal operation, even the big boys only use a few bottles a week and that's from accidental valvings and impurities that leak in from the ballonets.
On Shamu, we'd shoot gas any time the purity dropped below a certain level, and when in the hanger (the big one at Weeksville, NC tha burned down a few years back), we'd hook up to a purifier truck... a huge contraption that used extremely high pressure to filter the gas.
The largest single ongoing expense for our Airship Shamu operation was personnel. A big ship needs two dozen men, ranging from pilots and mechanics to ground crew. Those need to be housed and transported for traveling operations such as most of those in the aerial advertising biz. Fuel was up there, too, but in pure gallons per hour, it's very hard to beat an airship for fuel economy.
The smaller ships of today have evolved and survived largely because they need less crew and are cheaper to operate on an ongoing basis. Not so much over the cost of helium.
(name withheld by request)