I'd say swombat tackled that point appropriately. You have to remind your users of these things, but it doesn't have to be in the form of email communication.

I'd say swombat tackled that point appropriately. You have to remind your users of these things, but it doesn't have to be in the form of email communication. http://thesixtyone.com http://thesixtyone.com does a brilliant job of this through quests, notifications, and other on-site features. They aren't clogging up my inbox, but they are still telling me about new features, asking me to promote and share, and getting me more involved through internal communication channels. You can't be afraid to talk to your users.