Let me just give a probably totally irrelevant comment here. I think most of the open source projects have been in use by many people in production environment before the project had a "production release". I guess there are still places that think Linux is not good for their production environment.
Probably it is true for all the projects Pm mentioned but a lot of others as well. I remember I was using svn from v0.32 or so. In most technologies I am a very late "early adopter". I believe Rakudo and Perl 6 will see a gradual increase in use as they improve, get faster, have more modules etc. It will probably happen a long time before any official 1.0 release will be seen. (if ever) It is very frustrating that the progress is so slow and I can't yet use it for my daily work. It would make both my programming life and my "marketing" life a lot easier if I could use Rakudo at my clients. But can I seriously complain about the slow progress? Have I made a lot (or any) effort to help Rakudo? I wish I had some time contributing to the effort. Gabor http://szabgab.com/