We have only one mailing list so far: cordia-dev

This is a very low traffic mailing list, and you can discuss both Cordia HD and Cordia Tab related topics there.

To subscribe, send an e-mail to the cordia-dev+subscribe@lists.xiaoka.com address. List archive is available at http://dir.gmane.org/gmane.comp.handhelds.cordia.devel

See you at #cordia on Freenode. :)