Encouraged by strong member input, I've gone ahead and set up an Xsanity community wiki. I invite you to go and check it out, apply for an account, and add and edit content.
For those of you unfamiliar with the concept, wikis are web site with built-in editing tools. All the site content is available to be modified by the community. Existing pages are easily edited, and new pages are easily created. The goal is that cooperation will produce better quality than individual work. This fits nicely into our experience with the forums and blog.
Our wiki will be for content that changes over time, or that is improved by collaborative work. For example, we've already begun a glossary and a list of Xsan components.
By the way, the wiki is built using the collaboration tools in Apple's Mac OS X Server 10.5. If you haven't checked out a Leopard Server wiki, you are missing one of the best web applications available.
UPDATE: after a little downtime, the wiki is back up.
UPDATE 2: please join an interesting discussion of how we may use the new wiki.