Samba documentation collection

SAMBA Developers Guide This book is a collection of documents that might be useful for people developing samba or those interested in doing so. It's nothing more than a collection of documents written by samba developers about the internals of various parts of samba and the SMB protocol. It's still (and will always be) incomplete.
Man pages The Samba man pages in HTML.
WHATSNEW Samba Release Notes.