Oooh, ouch looks really neat! May actually cause me to retire my extract function. It suddenly feels a little incomplete by comparison, lol.

# Extract any archive
extract() {
        if [ -f "$1" ]; then
                case $1 in
                *.tar.bz2) tar xjf "$1" ;;
                *.tar.gz) tar xzf "$1" ;;
                *.bz2) bunzip2 "$1" ;;
                *.rar) unrar x "$1" ;;
                *.gz) gunzip "$1" ;;
                *.tar) tar xf "$1" ;;
                *.tbz2) tar xjf "$1" ;;
                *.tgz) tar xzf "$1" ;;
                *.zip) unzip "$1" ;;
                *.Z) uncompress "$1" ;;
                *.7z) 7z x "$1" ;;
                *) echo "'$1' cannot be extracted via extract()" ;;
                esac
        else
                echo "'$1' is not a valid file"
        fi
}