The problem isn't the idea of the wiki. It's the implementation. Any non-techie gets how to write a blog post in Wordpress. Spacing, make things bold, etc. I've been editing with various wiki software for years and I still find it cumbersome. If you can have a system that is a wiki under the hood but has a normal-person level interface, you would see more usage. Regular folks have better things to do than learn our o…
>The problem isn't the idea of the wiki. It's the implementation. We use Atlassian's Confluence. Confluence is a nice collaboration tool built on wiki concepts. Us techies used a wiki prior but Atlassian's almost-a-wiki-but-not-as-scary-as-one is now so popular that it is a major issue when Confluence is down. It is pretty much company-wide now and updated almost every minute.
Yes, it's not free (or Free) and is made by a pretty established company, but it's a solid product, Wiki enough that if you want to get into it, there is a lot fo customization and detail that you can do, but at he same time friendly enough that if you don't care, you can just use the WYSIWYG editor to make your point. It also integrates nicely with JIRA, although I doubt that's used by much of the HN crowd.
As for getting people to use it, my team made a rule that if you sent us a question that (in our opinion) belonged in the wiki, we'd answer it there and send you back a link. After a few weeks of doing that, people just stopped asking and went there first.