I think sending out a newsletter every month at the least is ideal to keep up appearances and to keep your audience updated. Of course not everyone will be subscribed, but those who are, will be updated. Anyway, I was curious how long you usually make your newsletter? I like to make my newsletters fairly short, but to the point. Update them on what's happening, the site, updates, etc. The usual stuff newsletters are for. Might also add in some ads and other promotion as well. What about you?