The bitcoin gets my inner libertarian's panties in a bunch -- maybe it offers a prototype for an alternative to state-managed currencies -- but doesn't seem to me to have much practical utility at present: there are already more than enough investment vehicles, one loses a fair amount of money in the form of transfer/conversion fees going from dollar to bitcoin and back, there's an unknown amount of risk since no one knows if the currency will pan out, there aren't many legal things to buy, and the logic behind its behavior is relatively opaque compared to, say, commodity futures.