United Nations Public Administration Network
"The long-term objective of UNPAN is to build the capacity of these regional and national institutions, so that they can access, process and disseminate relevant information by means of up-to-date information and communication technologies (ICTs) for the promotion of better public administration."--from the About UNPAN page. The site includes several worldwide directories and a Virtual Library organized by type of content, theme, language and region.
The IPAC is "...a membership-based organization that creates knowledge networks and leads public administration research in Canada." -- from the site. Many of their publicatons on public administration topics are available for download free of charge.
European Institute of Public Administration (EIPA)
"...An independent institute carrying out training and research on public administration and European policies"
Organization for Economic Co-operation and Development Public Governance and Management
"Good governance principles transform not only the relationship between governments, citizens and parliaments, but the effective functioning of government itself."--from the site
World Bank: Governance
"The Governance Global Practice (GGP) supports client countries to help them build capable, efficient, open, inclusive, and accountable institutions."--from the site The World Bank also supports a Public Sector and Governance Blog.