One more reason to love Apple. No product activation, no BS... they know ppl are going to copy within their own household, so why not actually capture that revenue? I live in a house with 5 Macs, this makes total sense... it will only cost $199 to upgrade these 5 computers to Leopard (Ultimate Edition per Steve's keynote 😀) ... can you imagine the cost of upgrading 5 PC's to Windows Vista?