Cool CLI autoexpansion of wildcards. Type ls thing*.png then Alt-* (i.e. Shift-Alt-8); expands to ls thing1.png thing2.png ….
update-alternatives maintains symlinks in /usr/bin etc., avoiding nameclashes of executables (recent example, git).
TODO: rename hosts after computer parts. 'So when something goes wrong, people sound like morons: “Why is motherboard down!?” “I can't connect to RAM!”' Also… make the hostnames mean something. How? Sth on the router?