Why would it be delayed. Apple is no longer a compter company, but a small tinket company with its iPod & upcoming iPhone. You noticed that resourses wre not taken from the iPhone to bring out Mac OS 10.5 on time.
You're new to Macs, I take it.
I've been using Macs since the early 90s and following Apple since around 95 and let me be very clear for the sake of any of you newer folks: Apple has ALWAYS made other products besides computers.
The iPhone, in this regard, is nothing new. At one time, Apple made printers and other peripherals. They branched out into eWorld, Newtons, CD players, Pippin, Mac TV, etc. And you know, they all flopped. But now that Apple is getting good at making these other products, people are freaking out. And nothing has really changed. They're just much better at it now.
So all this Chicken Little stuff I see is amusing at best, annoying at worst. Apple isn't going to abandon their computers, and delaying some products because they want to get the iPhone just right isn't sufficient evidence to start screaming about the sky falling. If you think that's in their plans, then tell me why the heck they just went through the agonizing and expensive process of moving the entire platform to Intel? Why go to the expense if Macs are on the chopping block?