This is a list of the top 57 wikis (by rank). It's interesting to see how they are being used and which wikis they're using. One thing Katriel Reichman said in the wiki interview the other day is that wikis are often best used when the topic is reference information. I haven't gone through each of the 57 wikis, but I bet one could learn a lot by perusing them for a few days.
I found this list by searching for wikis in del.icio.us, the most popular social bookmarking site.
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I'm a technical writer based in the California San Francisco Bay area. Topics I write about on this blog include the following technical communication topics: Swagger, agile, trends, learning, plain language, quick reference guides, tech comm careers, and certificate programs. I'm interested in information design, API documentation, visual communication, information architecture and findability, and more. If you're a professional or aspiring technical writer, be sure to subscribe to email updates using the form above. You can learn more about me here. You can also contact me with questions.