Read NetAction's Virtual Activist Training Guide to Get Started
The Electronic Advocacy site is also a good place to check out. Great resources and info, including resources to teach electronic advocacy.
Create a Blog to Provide Regular Updates to Supporters on What They Can Do To Advocate for Your Cause
Let Users Sign-up Online to Be Part of Your Mailing List for Action Alerts
Genocide Intervention allows supporters to sign up for automatic action alerts. They also maintain a listing of previous action alerts on the front page of their site.
Create and Upload Videos to Advocate for Your Cause
These student-created videos produced for Smart Youth NYC and these videos for Ignite demonstrate that you don't need professionals to produce and share high-quality advocacy videos through your website. Learn more about how they did it here.
Witness: See It. Film It. Change It.
Witness partners with human rights defenders teaching them how to record abuses and use video to create change.
Create a "Download Center" Where Volunteers and Supporters can Obtain All the Information They Need to Run an Event
The UN World Food Programme has create an online Download Center. Rather than mailing out packets of information for running events, supporters can simply download everything they need directly from the site to get it reproduced. They've also provided HTML code for people to put banners and logos on their websites and blogs. Not only does this make organizing events easier, it also encourages people to do it themselves.
Start an Online Petition
At the Petition Site you can create free petitions and also see the petitions that others are creating.
Find other petition-generating resources here (many are free!)
Create an advocacy mashup map.
The National Society for the Prevention of Cruelty to Children has developed a map they call "Be the Full Stop" that shows how the actions of individual fundraisers, donors, campaigners, volunteers link up across the country “to create an unstoppable force against child cruelty.” You can see the map here and learn more about it here.
Use MySpace to Build Your Community
Oxfam America uses its MySpace page to build support for its cause. This TechSoup article describes how their MySpace presence has increased sign-ups for their mailing list, increased volunteer requests, and driven traffic to their main website.