OpenDOAR is mapping repository data using Google Maps.
Here's an excerpt from the announcement:
SHERPA is pleased to announce the addition of a Google Maps extension to OpenDOAR, its directory of open access repositories (http://www.opendoar.org/find). Just run any search of the directory, and then change the output format from "Summaries" to "Google Map".
Here are a few examples:
1. http://www.opendoar.org/find?format=gmap&cID=jp
—Repositories in Japan . . .3. http://www.opendoar.org/find?format=gmap&cID=us&ctID=6
—United States repositories holding theses & dissertations4. http://www.opendoar.org/find?format=gmap&search=Nottingham
—Keyword search for "Nottingham"5. http://www.opendoar.org/find?format=gmap&rSoftWareName=
CONTENTdm
—Repositories using CONTENTdm software