You can participate in Mulgara by joining one of the mailing lists:
The Trac Wiki and Ticketing system is also a good place for current information. This is open for modification by anyone who creates an account. Logged in users can also create new tickets to report bugs and request features.
(Logins are required to avoid spam being posted).
You can look for someone live in #mulgara at irc.freenode.net.