Linked Data and Semantic Web Technologies are being actively promoted and adopted at a Government level, primarily in the context of Open Data as part of Open Government. Groups working in this area include the eGovernment Interest Group (eGov IG) which is exploring how to improve access to government through better use of the Web and achieve better government transparency using open Web standards at any government level (local, state, national and multi-national).
Putting Government Data online and Publishing Open Government Data provide guidance on publishing government data.
oeGOV - Ontologies for e-Government publishes W3C OWL ontologies for eGovernment.
Below are some more specific examples.
Barak Obama endorsed Transparency and Open Government. As a part of this Data.gov provides public access to high value, machine readable US Government datasets.
The Data-gov Wiki re-hosts datasets from Data.gov in RDF and lists them in the Data.gov Dataset Catalog .
What’s in Data.gov? http://blog.programmableweb.com/2009/07/20/whats-in-datagov/
Obama’s Groundbreaking use of the Semantic Web http://www.sitepoint.com/blogs/2009/03/19/obama-groundbreaking-use-seman...
President Obama uses RDFa http://www.sitepoint.com/blogs/2009/01/29/president-obama-uses-rdfa/
Tim Berners-Lee (Director, W3C) submitted the Linked Open Data proposal in response to the question posed by The Recovery Dialogue "What ideas, tools, and approaches can make Recovery.gov a place where the public can monitor the expenditure and use of recovery funds?"
The Web's next act: A worldwide database - government could lead the way
Building Semantic Web Applications for Government - An Exercise
New York City
The New York City Data Mine provides public data sets in a variety of machine-readable formats.
Open Ontology for eGovernment
Tim Berners-Lee is helping "drive opening of access to Government data on the web over” as described in the article UK Government Moves to Put Data on the Web.
More RDFa goodness from UK government web-sites http://webbackplane.com/mark-birbeck/blog/2009/04/23/more-rdfa-goodness-...
Linked Open Data in a Changing World (In the context of the UK government) http://www.jenitennison.com/blog/node/108
Launches Open Data Site: data.gov.uk provides background on the launch of http://www.data.gov.uk which provides UK Public Sector information and data as RDF with SPARQL queries and data.gov.uk is using Drupal.
Why Linked Data for data.gov.uk? provides some background on why the choice was made to open up the UK government data using Linked Data.
The wraps come off data.gov.uk! preview data.gov.uk. The site is powered by Drupal, with packages catalogued and hosted by CKAN. data.gov.uk hosts a data store powered by Talis that can scale to 100 billion triples and is hosted on Amazon EC2. The system is federated, so departments can add and control their own data, lots of which is available as RDF via a SPARQL end point , with the remainder downloadable in spreadsheet form. The Cabinet Office is inviting open data developers to participate in developing applications using data provided by the site.
There is also a SPARQL endpoint for education data at http://services.data.gov.uk/education/sparql with example queries at http://blogs.talis.com/n2/archives/818.
http://services.data.gov.uk/sparql is a combined endpoint that can be used to query across the available RDF data. It includes data also available at the following specific end points.
The Ordnance Survey endpoint ( http://api.talis.com/stores/ordnance-survey/services/sparql ) contains topological data for administrative and civil voting areas. Examples of the sorts of queries you can do are here: http://johngoodwin225.wordpress.com/2009/10/25/location-location-locatio...
Probing the SPARQL endpoint of data.gov.uk provides a good step by step approach for determining the type of data accessible at the SPARQL endpoint .
UK Government Data Developers
The Government 2.0 Taskforce is an Australian Government 2.0 initiative detailed further in Open Government Australia .
New Zealand Government
Open Government Information and Data Re-use Project
Government eyes private geo-data