A few people from the Early Modern Studies Group at Harvard have created the Theatrum Catalogorum which collates “library catalogs from every major European country” The next version should countain North American catalogs as well. Of particular interest is the fact that these catalogs are not just linked, they are annotated somewhat. While most of these notes are jus tinformation for English speakers on how to search the catalogs, library geeks will enjoy some of the meta-commentary such as “Many early modern holdings probably lost in an eighteenth-century fire.” or “Don’t bother looking in 1930-1991 or 1992-present catalogs.” [thanks pk]