I teach a few classes at Mesa Community College's Network Academy. Note that we have moved to the Southern and Dobson campus.
Upcoming FLOSS classes:
Check for more upcoming GNU/Linux classes in the Maricopa Community College system.
Call Business & Information Systems, 480 461 7771, and ask for Jessica in order to register for Network Academy classes.
GNU/Linux Networking Administration, CIS240DL, covers common services such as web(apache), mail, DNS, samba and SSH for GNU/Linux. Most of those services are operating system independent, so the class will also mostly apply to other *NIXen such as *BSD and Solaris. It is next scheduled for January 2012.
Here are some Free Software and system administration groups in Phoenix.