Andrew and I put together a small Linux 101 tutorial for new CS kids in our department. We collaborated on it using google docs for the outline and then google presentation to make the actual presentation.
Interested in virtualization? Do QCOWs rule your filesystem? Are you a libvirt or KVM+QEMU wizard? I wrote a book about virtual disk management. Check out the The Linux Sysadmin's Guide to Virtual Disks online for free at ScribesGuides.com.
Consider supporting the author by purchasing a hard copy of the first edition for just $10.00 on Lulu.com.
bitmath is a Python library for dealing with file size units (GiB's, kB's, etc) in a sane way. bitmath supports arithmetic, rich comparison, conversion, automatic best human-readable representation, and many otherutility functions. Read some examples on the docs site or check out the source on GitHub.