[http://rfrn.org/~shu/ Shu-yu Guo]
[https://blog.benj.me/tag/mozilla.html Benjamin Bouvier]
The Mozilla platform team has a [https://wiki.mozilla.org/Platform#Meetings public weekly meeting] where SpiderMonkey progress is (occasionally) discussed.
The [https://developer.mozilla.org/en/SpiderMonkey#Community js-engine mailing list] is generally used for communicating with people who embed SpiderMonkey, such as asking questions and announcing API changes. No actual development happens on the list.