TechSoup has recently moved its Style Guide and other editorial information to a wiki. Having this information online (rather than scattered in files) allows several team members to access it at once, and the wiki format makes it easy to organize and navigate a lot of data. Since the wiki can be modified easily, we can reprioritize or move information quickly and on our own. The wiki also allows you to add links to other sites, expanding its value as a reference tool.
As someone with limited html experience, I found the wiki easy and fairly intuitive. Referencing other wikis (like
Wikipedia) helped a lot. There is actually a lot of information on creating and desiging wikis on Wikipedia itself.
One lesson I learned from working on our Style Guide wiki is that a little planning can go a long way. Creating a general outline of how you want the navigation to work makes it easier to add information, and to organize it in a user-friendly way. One of the benefits of a wiki is that it is participatory -- so when designing one it's important to keep your fellow users in mind.
I would recommend that anyone interested in building a wiki start by looking at other wikis to get a sense of what they can do. Even if you're not currently interested in building your own wiki, you many find that there are wikis out there that can be a great resource for you.
Your first step in wiki participation might also be to add your organization's name to Wikipedia. Check out TechSoup's Wikipedia entry
here.