For a paper to be published, at least one of its authors needs
to be registered for the main conference. Accepted papers will
be published on the Workshop Web site ahead of the workshop. After
the workshop, accepted papers will be published by ACM in a post-proceedings
volume (with ISBN).
Update: accepted papers have been published
in the ACM Digital Library, under the name "Workshop
proceedings of the sixth international conference of Web engineering"
(ISBN: 1-59593-435-9).