I have a few brief comments then I'll STFU and let the community work on this. I never was a big del.icio.us user. But I am familiar with the problems that the community will face in a general way.
Here are the priorities in preserving what was created by the users.
1. As Stephen Jones says on Twitter, the data. Years worth of links and collections. The most important thing, but not the only important thing.
2. The domain. If the community is to survive, there needs to be something at del.icio.us (and delicious.com). Ideally it would be more or less exactly what's at the Yahoo site now.
3. The API. For apps that were developed to work with del.icio.us, preserving the API is important.
However, one more thing, if the activity of doing what del.icio.us does is to continue and to grow, don't make the same mistake again. Find a way to host your data in a place where you're seen as a customer, where there is a sufficient revenue flow to keep it operating.
I found it hard to get a handle on all the news about Wikileaks, so I attempted to do something about it.
The result is wikiriver.org.
It updates every ten minutes with all the latest WikiLeaks news, or more frequently for news from realtime feeds.
We still need more feeds, so if you know of a good one that we're missing, please post a link as a comment to this post.
I am hand-curating a feed to supplement the river until we get all the feeds we need in the mix.
The effort to create more visually pleasing rivers is going really well. Martin Duffly published a howto, and we have a developers mail list going to share know-how. This work is based on the JSON and static JSONP rendering of the various rivers I'm hosting.
I'm using the River2 aggregator running in the OPML Editor.
In addition to HTML, the content is also available in JSON, static JSONP and as an OPML subscription list.
You may include the content from wikiriver.org in your site, but please point back to wikiriver.org.
If you're working in a news organization on WikiLeaks stories, I am developing a new editorial tool for managing rivers like wikiriver.org. Get in touch if you're interested in collaborating. We'll be working over the holidays, in NYC. (Often a very productive time of year.)
I have more features in mind, as this moon mission project continues.