Self-executing anonymous function: http://briancrescimanno.com/2009/09/24/how-self-executing-anonymous-functions-work/
A key component of the module pattern. A function with no name that executes as soon as it is defined.
jQuery deferred: http://msdn.microsoft.com/en-us/scriptjunkie/gg723713.aspx
jQuery recently rewrote its entire ajax story to use deferreds. If you need to do any asynchronous coding, this is a good way to avoid callback hell.
Falsey and Truthy: http://jsfiddle.net/thejoecode/xB2Gk/
A jsfiddle to show what values are considered true or false. Quite a few gotchas here (empty string, zero, null, undefined are all false).
Book of speed: http://www.bookofspeed.com/
How browsers load pages and the effect speed has on sales.