NBII Metadata Clearinghouse
http://metadata.nbii.gov/clearinghouse/

The NBII Clearinghouse is a powerful resource for scientists, allowing them to share and access information about important research in natural resources. With over 88,000 records from over 70 data providers, the possibilities for collaborations and data exchange are endless. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This has been nadded to Biological Informatics Subject Tracer™ Information Blog. This will be added to Academic and Scholar Search Engines and Sources white paper.