I published one of the response essays in July's issue of Cato Unbound.
"It would be entirely reasonable for a developing country to dollarize to bitcoins, embracing sound money as a replacement for a faltering, untrusted national currency. Coupling bitcoins with free banking both introduces elasticity into the money supply to smooth out the price level and also creates a physical manifestation of bitcoins that people can trade for goods and services without needing Internet connectivity."
-- Chuck Moulton, "It’s a Sound-Money Alternative to the Dollar", Cato Unbound
The pieces of my colleagues are also quite interesting. However, I will correct Jim Harper later -- he is far too charitable to governments and dismissive of private money in his remarks concerning monetary history.
July issue of Cato Unbound (The Private Digital Economy):