I found a neat little plug in the other day for Word Press that lets you make a Wiki a post or page, that registered users can update on their own. (I'd be careful with that feature)
WordPress › Wordpress Wiki WordPress Plugins
For me, since I post a lot of events (location, ticket information, dates, performers and such), it is a cool way to let your readers know that you have all the information needed, and will be updated, and also displays a neat little Table of contents at the top of the article that links directly to each section.
I just started using it, but here is how it looks in action on a page without sidebars.:
It can be tricky to use with images at the top of the article, but it is a nice feature for informative or tech minded articles or tutorials....and a great way to break up longer articles.
It's also an unassuming way to insert your affiliate links into your posts like I have here in a post with sidebars.