:: I'd suggest that a list of hosts doesn't belong here.  Such a list belongs on the RoR site, where it can be kept up to date by experts, and where it sits alongside the RoR documentation.  I'm also a little uncomfortable with wikipedia providing free advertising for some selected companies.  And, finally, it seems to me that people looking up RoR are likely  to also look up Django, and so I think the two pages will be compared by wikipedians.  Well, the Django site doesn't list hosts, and this makes the present listing stand out ... negatively, in my personal view.