Q.  Brian, my Xbox is on One Side of My House and My Wireless Router is On the Other...Will This Still Work for Me?

A. YES! - With this method it doesn't matter what room of the home your wireless router is located in.  It DOES matter where your wireless computer is.

You need to be able to place your computer next to your Xbox so you can connect the two together, make a series of quick custom software changes to both the Xbox and the Computer and you'll instantly be able to harness the power of your computer's existing wireless connection to communicate wirelessly with your wireless router regardless of what room it is in.

This method works best with a laptop, but a desktop can be made to work in a pinch.  If you cannot place your computer next to the Xbox to make the tweaks I'll teach you then this method may not be the best solution for you.