I'm a poor choice to recommend things since I don't get much from videos except anticipation anxiety! Videos are slow. I like audio. And I agree cursory 'Distro' coverage is a little boring. But I'm not the majority so what do I know...
If they are easy to do for you I do have a few ideas of what many people continue to miss.
1. Overview the permission construct.
a. How root user tangles with a regular user.
b. multi-user, how it can tangle moving /home to another installation
c. using groups to help share directories and bridge 1a, ie 'wheel' group
2. Passwords- Why do we enter a password 50 times a day on our own 'personal' computer.
a. Root accounts Yes or No?
b. creating and using su or sudo, enabling power user mode for passwordless sudo.
c. polkit goodness, ditching gksudo and all other DE centric solutions.
d. why full disk encryption
e. extra credit; why when askpass is needed, shc for scripts with passwords.
Crimson's idea of 'Software Spotlights' is good, except the learning part - Sweet Home 3D is in the Debian reps's along with many of it's extra. Then modelling stuff in Gimp for use with it...fringe stuff maybe? I was a Acad for DOS guy and have a Sweet Home 3D for windows on CD! Ancient, still haven't dug into that...
I wonder how old S-Video stuff works in modern Linux's. I have a few I haven't used for a decade. How to make a poor mans DVR in Debian? I got that one covered, except no gui, nobody wants a cli/cron DVR nowadays...I could forward my notes on manually creating scan and channel.conf files...
Maybe a "SCARF" series! How to pull good ideas out of questionable distos and incorporate them into our own custom rolled installations.
Maybe some of the obtuse things I do like install-less installations; How to 'flash' a computer like you would a phone. Why install when you can simply image. Nobody 'installs' on a phone do they? Why install on a computer? I don't...maybe a chicken or egg issue.
An advanced series on understanding sysfs? How to cat and echo your systems parameters.
How to be a bug tracker? Using the terminal for gui feedback, using Valgrind and tracers?
Simple ideas? I think I have none...