Although they've been around for years (think Wikipedia, the site where users can add to the general knowledge base on a topic), wiki's are finally gaining some respect, and can have tremendous application in the advocacy arena. The "command and control" approach to the Internet is making way for a process where users can more interactively engage in the content on the sites they use. Essentially, any site that has a Wiki plug in allows users to edit the content they see on that page. So, for example, if you want interactive feedback on a topic or to collaborate on a project, Wiki allows you to do so quickly and easily over the web. Like Blogs, there are a number of locations where you can set up a free Wiki site. Here's a listing from Wikipedia http://en.wikipedia.org/wiki/List_of_wiki_farms
Consider how you can use this entirely cool and free software to engage advocates in the process of understanding and sharing their views on the issues you're working on!