Matt Warner has some great tips for parishes over at flockNote:
1) Be careful not to communicate too much – If you are trying to say everything, you’ll end up saying nothing. Consider the typical parish bulletin. Over time they’ve accumulated so much information in them each week that people don’t bother to even try to sort through it all. So you end up communicating nothing. The same goes for emails or letters you send out. If they contain so much information nobody bothers to read them, they aren’t doing any good. Say less and you’ll communicate more.
2) Respect parishioner time - Whether they are listening to announcements at Mass, reading your bulletin or surfing your website, don’t waste their time. Make sure that what you are bothering to say is important to your parishioners (not just to you). And try not to broadcast to everyone the things that only a small group of people need or want to hear. Eventually, they will just tune you out completely.