What we need, and what everyone wants deep down, is real, anonymous digital cash.
In real life, I can conduct a craigslist transaction, pay cash, completely anonymously and without involving a 3rd party. There is still no widespread way to do the same thing online.
Digital cash is something that has been possible for decades; the main problems with digital cash schemes are how to establish the value of the currency. There have been systems (like E-gold) that tie the value of the currency to some real-world reserves, but they have tended to get shut down by the government (even though you are allowed to trade futures on gold all you want, trading digital cash tied to gold is apparently not something the government likes).
There are other digital cash systems that make no attempt to tie their currency to the real world, and only ensure scarcity by hardwiring a limit to total amount of 'coins' that can ever be created. BitCoin is one of these. It's a fascinating idea and the value of bitcoins is still steadily increasing, but it hasn't caught on widely enough to buy/sell things to average people yet.
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