Presentations from the OAPEN seminar held on June 10, 2010 in Amsterdam are now available.
Here's an excerpt from the About OAPEN—Open Access Publishing in European Networks page:
OAPEN consists of a number of European university presses and universities, and is open to new partners. The publishing partners are all scholarly presses predominantly active in Humanities and Social Sciences (HSS) and book publishing. Jointly the members have digital publishing programmes, conduct experiments with OA, make use of digital repositories, publish in different European languages, have a worldwide distribution network (including the USA), and cooperate closely with university libraries.