Near - Miss Incident of Jets at LAX

Now that everybody has heard about the near-miss incident of Westjet B-737 and Northwest Airlines Airbus A320 in daylight at Los Angeles airport on 8-16-07, let's take a quick look and see what did happen and why. NTSB is investigating and the factual report will be forthcoming as usual.
A runway incursion or a near-miss? Some, including NTSB are calling it a runway incursion. However, so far the facts reported show that an incursion did not occur. It was definitely an incident, one that could have been disastrous for all. As a pilot I shudder to think what could have happened, and I'm sure the pilots involved have already relived the incident several times since. The passengers - how lucky they were that a collision did not occur. From the nose of the Westjet B-737 to the wingtip of the Northwest Airbus there was all of 37 ft.
So let's sort out the facts (or the reported facts) at this point. The Airbus was cleared for takeoff on Runway 24 L. The Westjet B-737 had just landed on Runway 24R and was positioned on Taxiway Y, wanting to cross Runway 24 L. Reportedly, he was cleared by Ground Control to cross Runway 24L. The Airbus has started takeoff and reached about 155 knots, probably ready to rotate. The B-737 managed to remain clear - we don't know exactly where on Taxiway Y - reportedly crossing the hold short line but not entering Runway 24, either moving or stopped.
The Westjet B-737 had arived from Calgary, Canada carrying 136 passengers and the Northwest Airlines Airbus was taking off with 150 passengers. At this point it appears that the PIC of the Airbus was properly cleared for takeoff by the Tower Controller. ( I do wonder if the PIC observed the the Westjet movements, which would have been ahead of him.)
The PIC of the Westjet would have to been cleared by the Tower Controller to cross Runway 24L - he or the Ist Officer switched to Ground Control without authorization from the Tower Controller during exit on Taxiway Y. The Ground Controller apparently assumed that the Tower Controller had instructed the Westjet to cross Runway24L.
It appears that almost all of the blame lies with the Westjet Captain and the Ground and Tower Controllers. In takeoff and landing operations there is no room for assumptions. The coordination betwen Controllers in the Tower appears lacking and the misunderstanding between the Ground Controller and the Westjet, particularly on the part of the Ground Controller, was primary to the incident. I wonder too, if the ground airport radar in the Tower was functioning for a reference.
In most respects, the misunderstandings shown in the incident remain inexcusable - but they do happen. In fact, they are happening quite frequently over the continental U.S. We'll see what the NTSB Investigators have to say. Thanks for listening. R.S.