I recently bought an iBook with a 1.33 GHz processor, 1 GB of ram, and a 60 GB hard drive. It's still 3 to 8 days until it gets delivered, but I was doing some thinking, and couldn't decide between Tiger and Leopard. It comes with Tiger and iLife (not sure what version of iLife). My brother has a Leopard install disk that he says he'll lend me if I want to install it. I am leaning toward Leopard, but only because it has a nicer GUI, in my opinion at least. I'll probably use Tiger on it for a week before deciding to whether upgrade or not.