Google now includes public data in its search results. At the moment it looks like it only works with Unemployment Rates and Population in the U.S. but it does show the potential of displaying public data with relevant search results. Hopefully we will see more public data made available. This reminds me of a Google Docs trick I came accross using spreadsheets and the Google Lookup function. You can see a quick explaination over at the Google Tutor blog.