The biggest features I use from zsh is awesome tab completion. For example, partial tab completion:

    $ ls
    ./
    ../
    project-foo/
    project-bar/
    $ cd foo <tab> ----> cd project-foo

Expand paths:

    $ cd /ho/wti/Drop <tab> ----> cd /home/wting/Dropbox

Fuzzy matching:

    $ cd /tpm/blh <tab> ----> cd /tmp/blah

Also expanding remote paths.