I have a Mac with Leopard installed (not Snow Leopard). I'm trying to start playing around with iPhone development, so I want to download XCode and the iPhone SDK. I found a version of XCode on Apple's site which runs on Leopard, but it doesn't have the iPhone SDK bundled with it, and I can't find the iPhone SDK anywhere except bundled with the latest version of XCode (and it won't run on Leopard, just Snow Leopard).
Where can I get a copy of the iPhone SDK for Leopard?