The Law Library of Congress (US) has launched the Global Legal Information Catalog
It describes itself this:
The Global Legal Information Catalog includes information about publications which reprint the laws and regulations of multiple jurisdictions on a particular legal topic. The purpose of the database is to provide additional identifying information about titles, beyond that which is provided in the Library's online catalog. The database works as an interface with the Library of Congress's online catalog and is searchable by jurisdiction, title, subject and keyword.
Results are returned in alphabetical order.
Interesting resource for comparative law