Google is now making it easy to analyze public data sources. You put in a term like “unemployment rate California”, and it will suggest a link to a chart, and from that chart you can start drilling down to more data (see video below).
There is also information available on how to make your public information more easily available.
How long before (a) you’ll be able to do this within an organization using OneBox? and (b) this is extended beyond the simple public data sources?
See “Find public statistical data through Google” and this post for more.