While we are great fans of Open Data, it is just one part of a spectrum from data that needs to be kept secure (such as personal information) through data that is shared between partner organisations all the way to data that is made available to all to use and reuse.
Our EPiServer search engine has made it onto YouTube thanks to a great blog post by Stein-Viggo Grenersen of BVNetwork on EPiLabs. The video shows how to use EasySearch with episerver categories (or topic maps classification) to provide high performance faceted filtering of full text search results.