e-lang mailing list - discussion of E and other capability languages.
cap-talk mailing list - discussion of general issues regarding capability security.
#erights IRC channel - On the #erights IRC channel at irc.freenode.net, you can talk to E as well as elang-ers online. Try saying "? 2+3".
Whiteboards are pages that members of various E and Capabilities discussions can hash stuff out upon.