while we spoke, to get a hardcore radio back in business, the infrastructure as a service is there. at ustream, one can do exactly whats needed, taking care for content, audience and growth. the prices starts at 99$ for 100 slots/user. 5 user is free, more then the entry plan is possible, for not named numbers.
the embeddable player, with activated social and archive function, can be seen and used, like below. sharing that link is then a click away.