CTDB is a cluster implementation of the TDB database used by Samba and other projects to store temporary data. If an application is already using TDB for temporary data it is very easy to convert that application to be cluster aware and use CTDB instead.
Davenport is a servlet which provides a WebDAV gateway to SMB shared resources. Typical usage would be to provide web-based read and write access to Windows shared drives. WebDAV clients, such as Windows' "Web Folders" can copy files to and from the share
Hm, didn't work for me, so I followed the "domain configuration way". But that's maybe interesting for others: "Accessing Windows Or Samba Shares Using AutoFS".