It would be nice if they used Amazon fulfillment for this. Their product is small in size, can be marked up without too much pain, and is desired by people in the US... so it seems like the perfect use case. I will probably forget about this since it's preorder and I don't really need it for anything... but if it was on Amazon, I would have already one-clicked it. FWIW.
Its been the better part of a year and you still can't just buy the stuff. Its always preorder, wait, see if they ship it on time. By now they should have some idea of the month to month demand for the stuff. It feels suspiciously like they're still in that fearful "collect preorders until we have enough to make a batch without risk and then order it" phase. If they're going to make the stuff, make it already dammit.
They had a booth at the Bay Area MakerFaire 2010. I played with it and bought me a small sample (expensive). IMO its pretty useful. Think of it as sticky putty that turns into a hardish rubber in a few hours. Doesn't melt or come apart easily.