Optware for the MyBook World

Install the package manager ipkg and prepare it for optware

Login your MBWE as root using SSH (or the serial console if you have one). Then install the itsy package manager ipkg and prepare it for optware using the following instructions:
FEED="http://ipkg.nslu2-linux.org/feeds/optware/cs05q1armel/cross/unstable" ipk_name=$(wget -qO- $FEED/Packages |awk '/^Filename: ipkg-opt/ {print $2}') wget $FEED/$ipk_name tar -xOzf $ipk_name ./data.tar.gz |tar -C / -xzf - mkdir -p /opt/etc/ipkg echo "src armel $FEED" > /opt/etc/ipkg/armel-feed.conf

Check for packages and updates

/opt/bin/ipkg update

Install a package

/opt/bin/ipkg install <foo_pkg> ...

opkg - the other package manager

I prefer to use the open package manager opkg (the successor of ipkg) instead:
ar p opkg_0.1.8_arm.opk data.tar.gz |tar -C / -xzvf -
The syntax of its commands is identical to ipkg, i.e. you have just to type opkg instead of ipkg.