daragh /.zshrc

A very simple .zshrc, the screen stuff is straight out of _why's .zshrc. It also has conditional package manager abstractions for aptitude, yum, and pacman.
# prompt
export PS1='%~ %# '

# history
HISTFILE=~/.histfile
HISTSIZE=500000
SAVEHIST=100000
setopt appendhistory autocd extendedglob

# autocomplete
autoload -U compinit
compinit

# export path
export PATH="/usr/local/bin:/usr/local/sbin:$PATH"

# prompt (if running screen, show window #)
if [ x$WINDOW != x ]; then
    export PS1="$WINDOW:%~%# "
else
    export PS1='%~ %# '
fi

# format titles for screen and rxvt
function title() {
  # escape '%' chars in $1, make nonprintables visible
  a=${(V)1//\%/\%\%}

  # Truncate command, and join lines.
  a=$(print -Pn "%40>...>$a" | tr -d "\n")

  case $TERM in
  screen)
    print -Pn "\ek$a:$3\e\\"      # screen title (in ^A")
    ;;
  xterm*|rxvt)
    print -Pn "\e]2;$2 | $a:$3\a" # plain xterm title
    ;;
  esac
}

# package manager abstraction aliases

# pacman
if [ -f /usr/bin/pacman ]
then
  alias update='install'
  alias upgrade='sudo pacman -Syu'
  alias install='sudo pacman -Sy'
  alias uninstall='sudo pacman -Rs'
fi

# aptitude
if [ -f /usr/bin/aptitude ]
then
  alias update="sudo aptitude update"
 alias upgrade="sudo aptitude safe-upgrade"
 alias install="sudo aptitude install"
 alias uninstall="sudo aptitude remove"
fi
 
# yum
if [ -f /usr/bin/yum ]
then
  alias update="sudo yum update"
  alias upgrade="sudo yum safe-upgrade"
  alias install="sudo yum install"
  alias uninstall="sudo yum remove"
fi

# aliases
alias mv='nocorrect mv'
alias cp='nocorrect cp'
alias mkdir='nocorrect mkdir'
alias ll='ls -lh'
alias la='ls -la'