BSD

ZFS is now included in FreeBSD (albeit still in beta).

Taosecurity.com has a great article how to keep your FreeBSD installation up-to-date, probably the first thing many people want to do after an initial installation. It's nicely explained for all you BSD novices out there.

Matt Fuller explains FreeBSD for Linux users : It's been my impression that the BSD communit{y,ies}, in general, understand Linux far better than the Linux communit{y,ies} understand BSD. I have a few theories on why that is, but that's not really relevant. I think a lot of Linux people get turned off BSD because they don't really understand how and why it's put together. Thus, this rant; as a BSD person, I want to try to explain how BSD works in a way that Linux people can absorb.

Read also his other rants, like Why Windows causes stupidity.

Most IT people know about VMWare, an environment that lets you run another operating system on your PC. VMWare will allow you to run eg Win 98 and associated software on your Unix/X11 workstation, displaying a window on your workstation, simulating a monitor on a PC. It's kinda strange seeing bootmessages appear in a window. But VMWare is pricy; you can use a VMWare copy for about a month with a temporary license, but after that, you are considered to pay for it.

Bochs is an open source implementation of VMWare. I was surprised about the maturity of the project. It's still not that advanced as VMWare, or as userfriendly, but if you have a minimum of geek capabilities, you can run an OS in it. I had to fiddle a bit with the virtual disk parameters, but finally got it working, and at this very moment, I'm installing FreeBSD in a Bochs cage.