I've started compiling a free ebook (at least free for now, I'm not sure what will happen), with updated information regarding Delphi 2006. The ebook, in PDF format, covers only new features introduced in Delphi 2006 and extends my printed book on Delphi 2005. A very early (non-edited) draft of the first chapter is available on:

http://www.marcocantu.com/md2005#d2006update

Any feedback via newsgroup or email (or here) is appreciated.