In my short time of using jQuery I've come across the invaluable method of noConflict(). Why is it so handy? Well, in the world of web design and development, there are lots of very useful JavaScript libraries out there (i.e. YUI, MooTools, Prototype) and several of them use "$" to represent an object. If you are using this syntax within jQuery and another conflicting library simultaneously, you are likely going to run into some unexpected behavior.
Luckily noConflict() is very simple to use and you won't have to go swapping out all your "$" with "jQuery". And to keep it simplistic I'll use the following code to show you how to implement it.
$(function() { $("#foo").click( // your code here ) // any additional code });

A fellow co-worker (