XBOX 360 Mods, Modifications, XBOX Chips, XBOX Hacks, XBOX360 Mods

i have a friend who modded their regular xbox and we both got a 360 and want to know if you can mod these to.

var:http://www.xbox360mods.org/can-you-mod-an-xbox-360-to-install-full-games-on-the-hardrive/