I'm intrigued by websites powered by wikis, where the content can be added, modified and deleted by the users of the site. When the people who are affected by the quality and structure of the content presented have some control over that content, you sometimes have an opportunity to get more useful, relevant, current material than if the site is maintained by a small number of content administrators.
At Summersault, our entire company intranet is a wiki. Anyone who works with us can edit the content on it, add new pages, delete stuff that they think is out of date or unhelpful, and so on - from small typo fixes to multi-page documents and images. If someone makes a change that needs to be un-done, the wiki software lets us "roll it back" or otherwise incorporate only partial changes. All of this gives us the opportunity to have an intranet "by and for" its users and our staff, instead of something built and maintained solely from a management point of view.
Wikis aren't appropriate for every kind of website, or even most kinds, but I've been thinking lately about what it would mean to have wikis power city, county and state government websites.
If these sites are primarily meant to be informational tools for use by the people who live in a given geographical region (and who are theoretically paying for the site's creation and maintenance), could governments give those people some control over the content on those resources?