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A Case for Zsh
http://www.daemonnews.org/199910/zsh.html
An advocacy essay for zsh.
Adam's Zsh Page
http://adamspiers.org/computing/zsh/
News and advocacy for zsh.
User's Guide to the Z-Shell
http://zsh.sunsite.dk/Guide/
Growing guide to using zsh.
Z Shell Information
http://zsh.sunsite.dk
News, documentation, and links to download zsh binaries.
Zsh FAQ
http://www.faqs.org/faqs/unix-faq/shell/zsh/
From the newsgroup comp.unix.shell
Zsh Workshop
http://www.acm.uiuc.edu/workshops/zsh/toc.html
An advanced guide for Zsh configuration and use.