Hubert Feyrer, for his PhD, put together a Virtual Unix Lab – a whole lab of NetBSD systems for teaching System Administration. It’s a good strategy for an environment where some percentage of the systems will be irretrievably mangled. It’s available as a book.
Here’s an article on chiptunes. (What’s that?.) The writing is very exacting, but the page has been liberally sprinkled with video examples of the source material. Read the dry text while being serenaded. Highlights: comparisons of Metallica to a 1988 C64 game, and compilation of crack screens. (via I lost track of it, sorry)