People are always skeptical about opening video game systems because it will often void the warranty. That is why the tutorial below is so nice because it will show you how to open your Xbox 360 without even making a mark on your system. They are careful to use only tools that most people have laying around the house like a CD spindle cover (very clever).
This looks like it will be a good start to modding your Xbox 360, now we just have to wait for the mod chips to be created. I am sure that they aren’t too far away.