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An iBook G3 (14 inch) is currently listing at $950 on eBay. A new G4 is $1299, which is I think what the old G3s sold for as well.

I had a hard time finding a comparably old PBG4, but a depreciation of only $350 will be hard to beat, when you're starting by spending at least $2K on a powerbook.
 
I think that if IBM starts generating CPU upgrades as quickly as it looks like they are doing, the days of Macs keeping a high resale value will soon be behind us.

I think that the resale values we've seen over the last few years was really because Motorola was so bad at putting out updates that a machine that was a couple years old really wasn't that much slower than one that was brand new.

Just like things work on the PC side, it will get to where nobody is going to pay 60% of new price for a machine that is 30% the speed.
 
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