Metadata infrastructure is well established as an essential practice within the GIS community. Quoting from the FGDC:
Metadata helps people who use geospatial data find the data they need and determine how best to use it. Metadata supports producers in locating and using their own data resources and data consumers in locating and using data resources produced by others.
In your experience how effectively do current standards actually help to achieve these objectives? I am particularly interested in analysis of ISO 19115:2003 and how it compares to over methods of capturing this kind of information.