So on March 23 we hear that Leopard's coming in October rather than spring, to wait for Vista compatibility. Later that day, Apple's official response is that we don't respond to rumors. The same day, someone says that Apple says Leopard'll come out on time. Three weeks later Appple announces that Leopard is coming out in October, but the reason is iPhone, not Boot Camp. So there you go. Wait. Did somebody say they're delaying Leopard to wait for Vista compatibility?!?!
Taipei-based DigiTimes was first on the scene. On March 23, they cited "industry sources" who claimed that the reason why Leopard is slipping is "not due to software design problems with Leopard but instead is attributed to Apple's plan to have its new OS support Windows Vista through an integrated version of Boot Camp."
So ZDNet asked Apple straight out for a comment that day, and got the very straight-out reply "We don't comment on rumors and we've made no announcements about Leopard availability more specific than Spring 2007."
Alas, nobody asked the obvious question: Delay Leopard for Vista on Boot Camp? Are you kidding? "We're keeping Leopard off the streets until we can support Vista" is a story that not even Jose Chung would buy.
(Please tell me you know who Jose Chung is. If not, follow that link, then check this one, too.)
Just when it seemed all was lost, up stepped our boy Michael Gartenberg from JupiterResearch Analyst Weblogs, with just the sanity we needed. He kept sniffing around the story, and firmly reports on the very same day, March 23: Just spoke with Apple who confirmed the reports are wrong and Leopard is still scheduled to ship in this spring as they previously announced. The rumor mill is wrong again.
Oops. Way to get it right, dude. The rumor mill is wrong, but so's your source.
Okay, back to actual news.
Anyway, once Apple announced the delay themselves on April 12, I like how very plainly they say that Leopard is running late, and they say plainly why: to ship iPhone on time, "we had to borrow some key software engineering and QA resources from our Mac OS X team."
Actually, I love it. Crystal clear. No excuses, just an explanation of the way it is, and the steps they're taking to get it all done.
While Leopard's features will be complete by [the Worldwide Developer's Conference in early June], we cannot deliver the quality release that we and our customers expect from us. We now plan to show our developers a near final version of Leopard at the conference, give them a beta copy to take home so they can do their final testing, and ship Leopard in October.
Getting it right takes as long as it takes. Love it. I've had to help craft similar statements, and they're much harder to get right than they look. Apple gets, as always, maximum style points.
The trade-off also sounds about right to me. They'll have iPhone out on time, and a tardy OS won't delay the sale of a single OCTOMAC (hey, that's right! Apple has new CPUs out!!) C'mon, it's not like we're talking about a release as disruptive as Vista....or even System 7 and OS X. 
For the record, I liked both of those releases...but don't try to tell me they weren't disruptive. Leopard'll be a walk in the park.
But my guess is that Apple will make more money from the first six months of iPhone sales than they might ever make from selling boxes of Leopard. The more I think about it, iPhone's sales in the first month will probably beat Leopard's total sales. I'm sure it'll sell plenty, but not iPhone plenty.
So my next guess is that this wasn't even a very long conversation around the ol' whiteboard...if it even got that far. No brainer.
PS. The address for you cats to send the iPhone? Right there on my business card. They'll sign for the delivery at the front desk. Thanks.