Window managers:
Gnome 2 was good, Gnome 3 was where it all went wrong, but now people are switching back to Gnome 3.
See also evilwm (joke) or xfce (supposed to be fast).
When Ubuntu's window manager went bad (11.04 -> 11.10)
(source)
A piggy bank of commands, fixes, succinct reviews, some mini articles and technical opinions from a (mostly) Perl developer.