Wikiseek - Search Wikipedia and its external links: An external search engine for Wikipedia. Not sure how this is any better than a site-specific search in Google, but I like the concept
The contents of Wikiseek are restricted to Wikipedia pages and only those sites which are referenced within Wikipedia, making it an authoritative source of information less subject to spam and SEO schemes.
Wikiseek utilizes Searchme’s category refinement technology, providing suggested search refinements based on user tagging and categorization within Wikipedia, making results more relevant than conventional search engines.
This goes back to my concept of FilterBlogs which I thought was great, but no one else really cared about.
Introducting the concept of a "filterblog": a blog that filters a single, large body of content to extract that content of value to a particular audience. I just made the word up, but I bet it could work.
Its a search engine for Wikipedia (of course) plus any site thats linked from Wikipedia. That one degree of separation from Wikipedia adds a lot of value. Its also a lot wider than a site-specific search yet presumably only authoritative and informational pages would be linked from Wikipedia.
