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It is in stock, but like many other O'Reilly titles, not yet in Safari. This is an example of a very useful book with time-sensitive information (a new Vista SP is about to ship), yet inexplicably did not appear in Safari Online Books concurrentloy with publication. Safari Online Books specifically promises these books will be available concurrently:
"Why Safari...Immediate access to the newest books - New books are added in conjunction with, or in advance of, their print publication."
Alas, many O'Reilly titles are delayed weeks or months from Safari access. To me it appears these are generally the "hottest" titles.