Growing compilation of public policy
publications from relevant think tanks, institutes and centers. Focus is on social policy and both qualitative and quantitative approaches to evaluating policy are highlighted.
Somewhat dated, and difficult to search, but full text of policy papers and reports. A digital archive of global, non-partisan public policy research. Collects and disseminate summaries and full texts, videos, reports, briefs, and multimedia material of think tank, university, government, and foundation-funded policy research
Current and historical; NBER is a private, nonprofit, nonpartisan research organization dedicated to promoting a greater understanding of how the economy works. Provides data sets about macroeconomics, industry, international trade, individual income and expenditure data, etc. Also includes working paper series. Many of these papers focus on the economic implications (intended and unintended) of various public policies.
A significant amount of policy research is available freely on the web, but may be difficult to locate efficiently. The advanced features of Google (date and domain limitations, publication types, etc.) can be particularly useful.