The purpose of Data.gov is “to increase public access to high value, machine readable datasets generated by the Executive Branch of the Federal Government.”
Point 7 of the Data Policy is laudable:
Public Participation
In support of the Transparency and Open Government Initiative, recommendations from individuals, groups and organizations regarding the presentation of data, data types, and metadata will contribute to the evolution of Data.gov.
Go check out the searchable catalog of datasets to see if it’s a useful resource to you!