It’s blowing my mind almost every day. Not only does it threaten the end of government money, it opens up myriad other possibilities — micro transaction to fund content, using the block chain to cryptographically verify first-creation of document, separating the holy trinity of commerce (ownership, identity, trust) into discreet entities. Bitcoin is going to be very, very big and everybody should be keeping an eye out.
Yes, there is a significant barrier to entry — difficult to use, difficult to buy Bitcoins with what I’m excitedly calling “legacy currencies”, not popularly accepted, the threat of loss or theft. Fear not, entrepreneurs are throwing themselves at all these problems — building civilization, as entrepreneurs always do.