I have been using the client library to add CardDAV suppport to ASynK - a bidirectional sync tool that now works with Google Contacts, MS Outlook, Emacs BBDB, and now CardDAV. You can find more about asynk at http://karra-asynk.appspot.com/ I have had to patch the latest code available from SVN. I have mirrored the official tree in the following repo: https://github.com/skarra/CalDAVClientLibrary and pushing my changes to the the 'asynkdev' branch ( https://github.com/skarra/CalDAVClientLibrary/tree/asynkdev) I would like to submit some of my patches back to the mainline. What would be the best way to do that? The most important addition I have made is the implementation of a MulitGet for CardDAV. -Karra