I note that the British Library ('the world's knowledge') has a labs page at labs.bl.uk to report on pilot activities. There is some information here about in-progress work with SRU/W, selective disclosure to search engines, research repository services, and others.

Welcome to British Library eIS Architecture Pilot Services. This site provides information about a variety of collaborative projects, experimental services, and services that are moving into production. [British Library eIS Architecture Pilot Services]