Feedbin.me has released the code that runs the service as open source, checkout out the Github. It joins Newsblur as being the second large for profit RSS reader to release its code in such a manner. I’m not aware of any other commercial services that open source all of their code.
This seems like a strong move that only a independent developer can take when faced with competition from well funded competitors. Being a 1 or 2 person team you can’t fight head-to-head with a Feedly or a Digg without doing something a little guerrilla. Open sourcing code makes a ton of sense in this case.