There's been some discussion of a central "clearing house" or notification site for requests for government information made under the Freedom of Information Act, and the information received.
http://www.yrtk.org/ is a site which publishes, in RSS, narrative about FOIA requests and results.
The Treasury log of disclosures under the FOIA is one example of a site that could easily be translated into a machien readable RSS log of transations.
The Local Government Category List is a sample taxonomy of government issues and domains of concern that would be compatible with an RDF/XML approach.
Structured outline of an RSS compatible vocabulary expressing FOIA transactions to appear here at some point.
http://www.WhatDoTheyKnow.com lets people make public Freedom of Information Act. The service is free and the public authority response is also published online.