~/.virtualenvs/postactivate: switch to working directory initially if it exists, and allow switiching between the env root and the working directory by typing "cd"

postactivate

WORKDIR=$HOME/work/`basename $VIRTUAL_ENV`

cd () {
    if (( $# == 0 )); then
        if [ -d $WORKDIR ] && [ `pwd` != $WORKDIR ]; then
            builtin cd $WORKDIR
        else
            builtin cd $VIRTUAL_ENV
        fi
    else
        builtin cd "$@"
    fi
}

if [ -d $WORKDIR ]; then
    cd $WORKDIR
fi