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I was pretty sure the last ones were the fourth. But I think there's been a model in there that was never released


Yeah, a lot of people are calling the newest ones "Rev D". Likely because it is the 4th revision of the 12 and 17 inch aluminum designs, but only the third of the 15 inch. All due to that weird 8 months where Apple had the 12 and 17 inch aluminum models released in January, and the Titanium 15 inch up till August. I was one of the many people that wanted a Powerbook that year, and kept waiting for an announcement of a 15 inch aluminum model. I just hope similar doesn't happen again, but I could see the G5 transition only starting on the 17 inch, then working its way down over time.