I've googled and come up with a couple of sites that give instructions for activating the sharing function of the macbook for OSX 10.5, and apparently, I can't get my 360 to find my DNS properly so that it can connect to live. After manipulating all of the settings as well as my router (since my cable modem broke, or there's a problem with one of the lines up to my modem) the only problem left is figuring out how to get the DNS to properly show up for the 360.

If anyone has done this before, the help would be greatly appreciated, as I no longer have an operating windows machine =/.