--[ Add sudo user to Kali ]

Open a terminal and issue the following command.

    #useradd -m

    -m creates a home directory for the user.
    Now we have to set a password for the user.

    #passwd

    It will ask you to create a new password.
    At this point, we have a new user account. But we might want to add our new user to the “sudoers” group, so that we can use “sudo” to do administrative actions.

    #usermod -a -G sudo

    The option -a means to add and ‘-G sudo’ means to add the user to the sudo group. If you want to know more about the usermod command, issue  #man usermod command to know more about usermod
    Now we have to specify the shell for our new user.

    #chsh -s /bin/bash

    chsh command is used to change the login shell for a user.
    All done.! you are all set. You could logout and login to your new account.

--[ Boot RPI with NFS storage ]--

Booting XBMC OpenELEC with NFS storage

I have had a raspberry pi type B for a few weeks now and one problem that I have is on the SD card which can get stressed and corrupt XBMC data. I was looking for a solution tonight and eventually stepped on it reading a few pages from the wiki. Since I still want to use the SD card, I just changed/flash/cmdline.cfg to contain this:
1
ip=dhcp boot=/dev/mmcblk0p1 disk=NFS=192.168.0.66:/media/xbmc
Of course, you will need to change the NFS server and mount point as they are likely to be different. Worth noting that I rsync’d the content of /dev/mmcblk0p2 (/storage in OpenELEC) so I would not have to scan my whole collection again.
There is also a full procedure to netboot your Raspberry Pi but this did not appeal to me, details there.