Very entertaining, but I feel like it should have been pointed out that the discussion of using cryptocurrencies in restaurants and gas stations is getting a little ahead of ourselves.
I think the reality is that Darkcoin's more immediate potential is in the fact that it will force the government to reveal their hand to the public. If Bitcoin were to get out of control the government only has to trace the transactions and persecute individuals. With Darkcoin they would have to take much more drastic measures such as using an internet-kill switch. Something they currently don't have legal right to use or create, and probably never will unless the whole world goes mad and lets it happen. On the other hand the American's did allow the Patriot Act to pass (and let's face it, the rest of the world didn't take much notice either), so who knows.
Necessity is the mother of invention. Western society's are being taxed to death, and now we have anonymous cryptocurrency.