The good message:
ArchiveGrid (http://www.archivegrid.org) is a new web site that offers faculty, scholars, librarians, and genealogists unparalleled access to archive records and finding aids to enable you to do the most comprehensive research possible on your subject. Search through nearly a million collection descriptions and get the information you need to arrange a visit or order copies.
Access to ArchiveGrid is free from March 1 through May 31, thanks to a funding grant to support wider use by the academic community and general public.
For more information, including how to link to ArchiveGrid on your Web site, see http://archivegrid.org/web/jsp/linking.jsp
Visit the website at http://www.archivegrid.org
And now the bad one:
After May 31 it’s a subscription service. RLG (Research Libraries Group) should better make such meta-searches available with „Open Access“ . With promoting the OAI standard such attempts to make money with things which should be free will fail because OAI Service Providers like OAIster can harvest the archival collections.