Snow Leopard costs $29, that much is clear. And Leopard users should have no troubles going from 10.5 to 10.6. My question is, how do you upgrade from Tiger to Snow Leopard? I don't want to buy the Mac box set (that comes with iLife '09, etc) but I will be getting Snow Leopard for $10 with up-to-date. I also have a Leopard install disk, which works on unlimited computers (buying a family license is the same disk, different rights). So to get from Tiger to Snow Leopard legally, does that mean I need to buy Leopard, upgrade to it, and then do another OS install for S. Leopard? Or will 10.4 to 10.6 work fine?