I myself did so, just now. I had been patiently invested in PAL for the last two years, all the way down to 3.5 but this explosive spike warns me to take profit.
I see a lot of wild volatility ahead. The Hot money is now in the PGM's; price manipulation and profit taking follows.
Long term: fuel cells, yes. And maybe they can come up with Palladium-based catalysts for diesel fumes. But I'm not holding my breath, waiting for that. Cold fusion? Maybe some demand from researchers, initually.If there is a breakthrough? Speculative.
But Blue Ray? Give me a break. Demand for movie DVD's will be curtailed by the use of internet-provided data-centers, such as Google is building. Storage-on-plastic-disks will soon be obsolete.
In the end, you can compute the demand for palladium from these plastic disks and come up with a formula of micrograms of palladium needed per terabyte data storage.
What drives this market currently is journalist utterings like "with some analysts believing platinum is on its way to $3,000".