Another way of using the web and email lists together is by putting a special mailform on your homepage. This mailform asks web readers who support your work for their email addresses, which you then add to the email list. I maintain an email list that has doubled in size to nearly 100 names because I put such a mailform on the group's corresponding webpage. It may seem silly, but it's important to put your web address onto any piece of paper you send out. It's odd that people who already see what you're doing will run to their computer and see the same thing, but it does happen.
Web addresses are especially important on printed material which has space limitations.
Having the address there gives people an opportunity to find out more about the group, ask to get on their mailing list, find local contacts, and sign up for email alerts. It also reinforces WRL's identity by giving prospective members another glimpse into the organization's work. A web-savvy member of your organization might already know what related resources are online. Even if they don't, they'll often be thrilled to do the investigation required to find them. Simply describe your group's work, request a link, and give it's web address.