I learned Emacs last year from the O'Reilly book, "Learning GNU Emacs" - http://www.amazon.com/Learning-Emacs-Third-Debra-Cameron/dp/...

It's an excellent reference and introduction. I also blindly followed Steve Yegge's advice here too, which turned out to be great: http://sites.google.com/site/steveyegge2/effective-emacs