Several threads have entertained the notion of an island community build around a Bitcoin economy. This project might be of interest:
/r/redditisland is a reddit community in the process of purchasing a private island to start a new reddit community. As we get closer to making it a reality, a few things have come up like currency. It seems to be between hard currency and something like BitCoin.
http://www.reddit.com/r/Bitcoin/comments/ueui4/question_about_very_large_bitcoin_transactions/