Alaska search interface
http://ak.aoos.org/op/data.php?region=AK&metadata=y
Asia Pacific Natural Hazards Network Clearinghouse
http://www.pdc.org/.../explorer.jsp
Central and Northern California OceanObs
http://www.oceanobs.org/
Great Lakes Monitoring Inventory
http://mds.glc.org/.../search.html
Lake Michigan Monitoring Inventory
http://mapserver.glc.org/.../search.htm
NSDI Clearinghouse List
http://registry.fgdc.gov/serverstatus/
Puget Sound Regional Synthesis Model Metadata Catalog
http://www.prism.washington.edu/.../index.jsp
SCOOP Catalog Services
http://scooptest.sura.org/services/catalog.html
SCOOP Inventory Services
http://scooptest.sura.org/services/inventory.html