Bing Maps extension (http://joomlacode.org/gf/project/bingmaps/):
With this extension, Joomla! users can easily include customized Bing Maps into the content they are publishing, and administrator can preconfigure how the map should look, and where it can be added.
Silverlight Pivot viewer extension (http://joomlacode.org/gf/project/pivotviewer/):
With this extension Joomla! users can visually navigate with the Silverlight Pivot viewer through large amount of data. Administrators define what is the data source using a set of preconfigured options like OData, RSS, media files, etc, .
Windows Live ID extensions(http://joomlacode.org/gf/project/windowsliveid/):
With this extension Joomla! users can associate their Joomla! account to their Windows Live ID, and then to login on Joomla! with Windows Live ID.
OData extension (http://joomlacode.org/gf/project/odata/):
With this extension Joomla! administrator can provide users with quick access to any OData source, like the Netflix catalog (check the list of live OData services), and let them include these in any content type (such as articles). The generic extension includes a basic OData query builder and renders data in a simple HTML Table.
These extensions are developed and contributed by Schakra and MindTree, with funding provided by Microsoft.