If your parish does not currently have a web site, then it really, really should. Once you have a site, keep it up to date. At the very least, make sure that service times are correct -- but preferably refresh the copy weekly.
New Diocesan Web Hosting
The Diocese offers free web hosting to all parishes acting as a 'reseller' for a modern, reliable hosting company. For more information on this, please visit www.ednyhosting.org
For smaller sites we strongly recommend using Wordpress as a tool, both to build the site and to administer it. Instructions for getting started with Diocesan hosting and setting up a simple Wordpress site using it are available here