About EPCglobal
http://www.epcglobalinc.org/home
About ONS standard (release available v1.0.1)
http://www.epcglobalinc.org/standards/ons
About Discovery Service (standard in development)
http://www.epcglobalinc.org/standards/discovery
This page may have a more recent version on pmwiki.org: PmWiki:AboutEPCglobalStandards, and a talk page: PmWiki:AboutEPCglobalStandards-Talk.