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LocalHero is a local search proof of concept that allows the user to explore hyper local news, review, views, and blog posts geo located to specific locations. At the moment only Melbourne, Australia is covered.

LocalHero uses Calais to identify the people, companies, and facilities etc that are mentioned in the geo-located content and augment the tags already added by content creators.

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Ecovian is a web community for sharing green & sustainable living
information within major metropolitan regions. The site lets members
find eco-friendly local businesses & other local green living info,
rate businesses based on their greenness, share and discuss local environmental
news, discover nearby green events, and form groups with other members.

Interceder is a mashup, built using...

• Daylife to search through the latest news and display associated metadata such as tone analysis and favicons.
• Open Calais to create semantic metadata and enrich the latest news, video and photo results.
• Freebase to gather further content on the entities returned by Open Calais, such as images and links.
• Yahoo Pipes to pull in the latest stories on the top news sites and return the latest videos and photos for a given search term.

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Wirecatch.com is a semantic news aggregator and graph developed using the Calais Web Service. It takes the most popular stories from several news feeds and show the entities, facts, and events in an interactive Flash network graph. Currently in beta, they welcome feedback, suggestions, comments.
 

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LinkedFacts.com is a very interesting demonstration of a semantically powered news search application.