I've already rmentioned ISO 15489 and DoD Std. 5015.2 but am referencing them again in the context of this question posed to presenters at the conference.
ISO/IEC 11179 is the international standard for metadata registries. Registries are important not only for interoperability at the machine processing level, but also for semantic meaning at the level of human comprehension. Additional information is available at http://xml.gov/iso11179.htm
XForms is an initiative of the W3C, described as "the next generation of Web forms." Additional information is available at http://www.w3.org/MarkUp/Forms/
UDDI is an open standard for the Unversal Description, Discovery, and Integration of services on the Web. Additional information is available at http://www.uddi.org/