linux is good at many things. the most useful thing i have found to use linux for is virtualization. qemu/kvm, vmware, virtualbox are the virtualization programs/servers i am familiar with. vmware and virtualbox are easy. qemu/kvm is a bit more difficult (but well worth the effort) as you have to compile a kernel with support for it. vbox and vmware are nice because you can wrap virtual machines up and share them with friends with little hardware change to throw compatibility problems.
qemu/kvm is more useful with a good front end on top of it. aqemu is a visual program to manage virtual machines. aqemu is written in QT so its got the polished kde look going on.
virtual machines are a must. when writing tutorials on installing software, you want to start from absolutely nothing installed to find all the dependencies of a package, and not get mixed up with depends that your system has installed for running other programs.
virtual machines let you test installing software and build up procedures to get software installed if it becomes a complicated chore.
xen is another virtualization solution i have not yet investigated.
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