An anonymous reader writes: Coinbase, one of the largest bitcoin exchanges, introduced a "Shift Card" today, which is a Visa debit card that allows users to spend bitcoin wherever Visa is accepted within 24 U.S. states (other states are blocked by regulations for now). The card acts as a currency exchanger, debiting your Coinbase-controlled bitcoin wallet for an appropriate amount of bitcoins, based on market rates, while sending U.S. dollars to the merchant at the other end of the transaction. It represents a very simple way for bitcoin holders to spend it on real-world goods. That said, it'll be interesting to see how much adoption there is. If you prefer to keep full control of your bitcoin wallet, or prefer to keep your name from being attached to it, then the card probably won't work for you. It seems likely that most people who actually own bitcoins would fall into one or both of those categories.