How to Answer "Why Do You Want to Work for Us?"

One of the more common interview questions these days, especially for entry-level positions, is some form of "Why do you want to work for us?" Other forms of this question include "What attracts you to our firm?" and "What about our firm excites you?" Whatever the exact phrasing you receive, there are a few things you want to get across as clearly and concisely as possible when answering.