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"This "sandbox" allows you to carry out experiments and to try your "Semantic MediaWiki" skills. Note that the language of this wiki is set to French (fr)."

Semanticommunity.net: Community Infrastructure Sandbox for 2010

Try out standard CKAN functionality in a sandbox environment. Search for datasets directly from the homepage or by navigating to the Datasets search page where you can facet by tags, groups and format. To add your own datasets, just sign up and create your publishing organization!

Mondeca Labs is our sandbox : we try things out to illustrate the potential of semantic web technologies and get feedback from the semantic web community.

Silverlight's extension eliminates several manual steps and is can be deployed to a sandboxed solution.  The link above has short written directions as well as a video that explains and demonstrates the new feature.