The Yale University Library
Content 
Considerable quantity of updated resources, well-structured metainfo, abstracts and datasets. Electronic bibliographic catalogues are provided along with digital collections and multimedia databases.
Selection 
Contents are selected and organized by the Yale University staff
Format
Metainfo and comments are provided for articulated sets of records. Orbis database allows all users to retrieve info in different formats as well as in digital collections
Information density
The Yale University LIbrary provides a remarkable amount of rich-in-content resources with abstracts, comments and metainfo
Content Pertinence to Political Science
An entire section in the Yale database is dedicated to Political Science, statistics and social sciences. Other collections provide also PS related materials
Updating Rate
New content and resources are posted online with a good frequently, according to the library's online acquisitions