Otis Gospodnetic interviews Shay Banon of ElasticSearch, a large-scale data-grid level distributed search solution using the most modern architecture approaches. Some comparisons to Solr, but this is a completely different codebase.
My short article for InfoToday NewsBreaks discusses the functionality, interface and uses for the Greplin personal cloud search engine. It's built on Lucene and other scalable server software, and the OAuth protocol for accessing accounts. Useful service, a cute company story, but they may find fierce competition in a few months.