In 'Community: From Little Things, Big Things Grow' on ALA, George Oates from Flickr says:
It's easy to get lost on Flickr. You click from here to there, this to that, then suddenly you look up and notice you've lost hours. Allow visitors to cut their own path through the place and they'll curate their own experiences. The idea that every Flickr visitor has an entirely different view of its content is both unsettling, because you can't control it, and liberating, because you’ve given control away. Embrace the idea that the site map might look more like a spider web than a hierarchy. There are natural links in content created by many, many different people. Everyone who uses a site like Flickr has an entirely different picture of it, so the question becomes, what can you do to suggest the next step in the display you design?
I've been thinking about something like this for a while, though the example I've used is Wikipedia. I have friends who've had to ban themselves from Wikipedia because they literally lose hours there after starting with one innocent question, then clicking onto an interesting link, then onto another…
That ability to lose yourself as you click from one interesting thing to another is exactly what I want for our museum sites: our visitor experience should be as seductive and serendipitous as browsing Wikipedia or Flickr.
And hey, if we look at the links visitors are making between our content, we might even learn something new about our content ourselves.