I've uploaded a paper by Brad Cox to ftp://asylum.sf.ca.us/pub/fsb/cox.txt.
This paper discusses a scheme for software sharing that includes built-in
compensation.  It's not really about freedom of software, but I was thinking
that the infrastructure he proposes would also work for low-overhead support
payments.  And, on an opinion level of discussion (as opposed to factual),
I was wondering if such a scheme would be good for software freedom?
-russ