The Green Book (2012) is a key resource for federal programs. It provides updated statistics and information on programs such as Medicare, Social Security, Unemployment Compensation, Foster Care and welfare. Additionally, it includes a discussion of related issues, such as the well-being of the elderly and of children and families.
LexisNexis Congressional contains congressional documents (hearings, committee prints, documents, and legislative histories) which are searchable through this fulltext database. CRS Research Reports are particularly helpful for overviews of federal policies on an array of topics.