Well, I am downloading nightly builds but now that I think about it... If I merely use dd to 'burn' the iso image to USB key, I don't expect I could save the games played on the USB key. Or could I? I guess I might want to use a 8 Gb key, with 4 Gb for the image itself, and the rest for the /home partition. Not sure how, if, this is easily doable.