"Launchpad was created in large part to allow them to interact more fully with "upstream"
maintainers, but they haven't published it, unless you consider making it available as a web
service that anyone can subscribe to,
No, No one considers that 'publishing'. That's offering access to a closed-source service.
Same as google or hotmail, etc.
If you want to see an open source and published hosting system, take a look at