If you are interested in playing with the latest features and improved performance that will be coming in version 1.2, you can try out GoJS - Build Interactive Diagrams for the Web. I’m not going to bother summarizing the changes – you can read about it in the ChangeLog.
You won’t be able to get an alpha library that is tied to a domain, though. That will have to wait until beta comes along, which shouldn’t be too far off.