According to Wikipedia, a Swicki is a social search engine created by eurekster. Swickis, like wikis, are collaborative, so users can modify and improve the focus of the search engine.
From what I’ve seen, swickis are search engines that you can put on your web site or blog. Visitors to your web site can use the swicki to search your site and/or the Internet. Visitors can also rate the results of the search engine. The search engine will learn from the ratings and will rank results accordingly. The swicki will also track which results get the most clicks and will weight those accordingly as well.
The theory is that the community of visitors to your site would create search results tailored community members by highlighting results they like and discarding results that were not appropriate or applicable.
Here are a couple of examples:
Info for NY http://new-york-city-swicki.eurekster.com
Popular Science http://www.popsci.com
I think swickis are very interesting in theory – but in practice I didn’t find any that jumped out at me. Maybe it’s just too early to tell.