There is a lot of information about the z-shell on the net. To give you a starting point, we'll link a few of the inofficial pages here.
- introducing the Z shell - at ibm.com
- A Workshop by Larry Schrof
- Phil's prompt a walkthrough to a more advanced prompt
- Bits from ft's setup — with link to its VCS repository.
- zsh-lovers manpage - at grml.org
- Many examples by strcat contains a shell overview, differences between the shells, ..
- German translation of the page above incomplete; help needed!
- Linux Magazine (requires free registration):
- Tux Radar