Based on World Bank activities and publications, data and reports available here mostly cover governance research indicators for hundreds of countries worldwide, also addressing specific issues and providing useful material in PS-related fields
The Governance Databank is maintained by the Governance Group of the World Bank
These series of datasets offers structured and organized information. There are several levels of data available about Governance, from methological papers to comparative graphics to world map navigation and country stats, including data in Excel format
Specifically addressing such issues as Political Stability and Government Effectiveness, Databank offers access to over 140 datasets
Dealing with the various dimensions of governance, this database content provides hot data for PS students and scholars
The general database references seems to have a fair updating rate, although this varies within the specific database or subject