Teaching Linux/Unix Basics to Microsoft Junkies?

flupps asks: "I've been asked to hold a two-day crash course in a class of students that currently are studying to become MCSD certified. I'm looking for ideas how to set this up. I was thinking about starting with some general file system descriptions, where to find what files, the man pages, the tab-button, etc. After that move on to some of the daemons and just explain what they do." He's got at least one idea to start with (below), but what must-have skills or demonstrations would you add?

I also plan to set a database program in VB (one of the certificates in the MCSD suite) against a MySQL or Postresql db and show that there are free alternatives that works as well as SQL server.

What would you think could be a good addition to teach them?

This is in no way meant to be a very advanced course, but I want to show some of the excellence of *nix and why you sometimes can save time and stability and maybe make them interested and read up more by themselves afterwards.

Any suggestions very welcome.