It depends on what disc is install. You don't know if it's the retail version, or the version that ships with new Macs. If it's retail, then you would first install Leopard, and then use the Tiger disc ONLY for iLife apps. If it's the version that ships with new Macs, then it would all be on one disc. However, no one in that thread you pointed to knew which one it would be. The point is that if you can instruct someone on how to install Leopard, then installing the iLife apps off another disc is even EASIER. If you don't care how long it takes to get it, then by all means wait, but don't try and justify your waiting by saying there's advantages to having Leopard pre-installed, when in fact, it's the exact opposite.