Just a quick question regarding how to update Gentoo. I have noticed that more optimised Stage 4 tarballs are available to be installed and I am wondering how I would be able to use them to upgrade my current setup (which is basically my media center running freevo). Are the stage 4 tarballs just all the system files minus the etc directory? Is that is the case can I just extract over the top of my existing system (perhaps I need to do it from the livecd?). I am wondering if when I update I would need to re-compile my existing installed applications?