Here are description of a community currency system. A review of a Baltimore Green Currency system is available for a sample system.
A OG_Currency_Model_Adaptation_Update draft for Odishagateway can be accessed here.
Another time based money system, (Bay Area Community Exchange Timebank, BASE) under consideration.
The Bay Area Community Exchange Timebank, BACE, is a community of reciprocal exchange that aims to create a resilient web of relationships between individuals and with community service organizations.
The Timebank helps facilitate better communication and distribution of resources while encouraging community-building through more in person contact at complementary events, classes, skillshares, swaps, nonprofit volunteering opportunities and organizational partnerships.
For up update date follow blog by Michelle Singletary (http://www.michellesingletary.com/home.html site), The Commodity Futures Trading Commission (www..cftc.gov/bitcon), and American Enterprise Institute (www.aei.org).