iPhone sdk for OSX 10.4

On the apple website I can only see o开发者_运维知识库ffered the iPhone sdk4 which indicates it will only operate on OSX10.6/Snow Leopard. Is this the case? And if so, where can I get the previous sdks so that I can work on my computer with OSX10.4?

There isn't a version of the iPhone SDK which works with Tiger. You also need an Intel Macintosh. You can still dowload the old (mac) SDK but it won't allow you to develop for iPhone, only Mac.