To get the latest news on OpenMath in a timely manner:
om@openmath.org is a general public discussion list for any aspects of OpenMath. (subscriptions, archives)
om-announce@openmath.org is a low-volume list for general announcements related to OpenMath. (subscriptions, archives)
om-members@openmath.org is the private list of the society members.
om-sc@openmath.org is the private list of the society steering committee.
infrastructure@openmath.org is the list of the infrastructure group