I've always like the idea of a currency based on an hour of work. It's used in some communities. Looks like this has evolved into a time bank:
Time Banks Weave Community One Hour at a Time
For every hour you spend doing something for someone in your community, you earn one Time Dollar. Then you have a Time Dollar to spend on having someone do something for you. It's that simple. Yet it also has profound effects. Time Banks change neighborhoods and whole communities. Time Banking is a social change movement in 22 countries and six continents.
http://www.timebanks.org/
Any comments on this use in communities?