Arthur_itis has a good idea there. Loads of churches on facebook. Just set up a group. It does mean that members of the church who want to see what is happening will need to create a personal facebook account which for some may be more trouble that it is worth.

Have you thought of e-bulletin? Create a church email account on hotmail, yahoo, google or whatever. Then let people sign up to receive electronic bulletin by email.

Whatever goes in the printed bulletin can go into an email as text or attachment. When you create th bulletin before you send it to be printed, send it in an email.

Easy to do distribution lists on Outlook so you can send to many people at once. But remember to send on bcc (blind carbon copy) so you are not sharing all those email addresses with everyone you send to.