The World Wide Web is of course just one part of the Internet. Another important tool is email lists. Lists are a more-active way of getting information out to folks, because you are initiating the communication. This is different than the web, where you have to wait for supporters to revisit your page. For fast-breaking announcements, email lists are a better option than the web.
Email lists are relatively simple to administer with good email programs.
Email lists and the web can be used in conjunction in at least two ways. In your email announcements, you can refer to your website and to further information about the event or project that can be found there. For example, I have a cyber-literate friend who recently sent out a wedding invitation over an email list. It was a simple email, with time, place, etc., but it included a reference to a web page that included photos, bios, and a scanned image of more-traditional invitation. Another way of using the web and email lists together is by putting a special mailform on your homepage.