Data.gov has been open for business for about two weeks but with fewer than 100 data sources available it's now just a teaser of a site.

Data.gov is cataloging data and presenting it in standard formats, such as CVS or XLS, or Keyhole Markup Language (KML) used in Google Earth and XML, among others. In many cases, agencies will develop widgets and other tools . A simple example is the .

But the real test will be public adoption. Federal CIO said is "a very high priority" because he believes it has the potential of "unlocking the innovation and tapping into the ingenuity" of the private sector as well as Americans generally. Users will also be able to rank data sets on their utility, usefulness, and ease of access.

Over time, the U.S. will continue to expand the data sets, as well as add tools to help users extract and work with government data.

Kundra's hope is that people will take data from multiple sources and develop new insights. "The intersection of true value is generally around multiple disciplines," he said, in a briefing today with reporters.