Hello and welcome to project OpenIndiana!
You were probably sent to this page because you expressed an interest in getting involved. That's great! This project depends on community contributions and the more who get involved, the greater the outcome. So thank you from the team here for taking the plunge!
We'd strongly recommend you sign up to our mailing lists, where our announcements and discussions take place. This will allow you to keep up to date with the project.
Our primary discussion takes place on our IRC Channel, #openindiana on irc.freenode.net. We would strongly recommend joining this, as you will miss out on the latest developments and struggle to collaborate via other less interactive methods.
Please also take a look at our Bug Tracker, which contains not just bugs but feature requests and work that needs to be done. This is a great way to get involved with the project.
More information needed, including info on accessing dev boxes, repos, upgrading, how to build stuff, etc.