The latest tDAV code is available from AOLserver.com CVS: http://cvs.sourceforge.net/viewcvs.py/aolserver/tdav/
This code is newer than 1.0 and includes a redesigned API and plug-in architecture for authentication, locks, properties and storage.
The previously released version is 1.0 and can be downloaded from http://tdav.museatech.net/file-storage/view/tDAV/tdav-1-0.tar.gz
tDAV is used to provide WebDAV support for the OpenACS community web application platform.