Commits, patches, modules
Here at Echo & Co., we make extensive use of the Display Suite module, which means that we also use a lot of view modes.
Callbacks! Every fancy jQuery plugin has them
and they are almost always specified along with all the other parameters when the plugin is initialized.
I've just released version 2.3 of the Sites module, which has been quietly under off-and-on development for a couple of months now here at EchoDitto Labs.
I see you like to read printed material. You should check out Nicco's book The End of Big: http://endofbig.com