WebDAV

DAV Resources
Hosts Cadaver, DAVLib, Goliath, Mod_dav, Neon, and PerlDAV projects. Also includes news, a FAQ, links to other software and articles.
http://www.webdav.org/

IETF WEBDAV Working Group
Overview, mailing lists, draft documents, links to related working groups and to implementations.
http://ftp.ics.uci.edu/pub/ietf/webdav/

RFC2518
This document specifies the Distributed Authoring Protocol, a set of headers and methods which extend the Hypertext Transfer Protocol to provide capabilities for overwrite prevention (locking), properties, and namespace management.
http://tools.ietf.org/html/rfc2518