if i remember right, your's should be the 1440x900
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if i remember right, your's should be the 1440x900 - but it can be replaced with the 1680x1050
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there are sellers on ebay that will do the repair/change with the hi res lcd [http://cgi.ebay.com/REPAIR-SERVICE-17-INCH-PowerBook-G4-LCD-SCREEN-/250627403659?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3a5a8eaf8b|CLICK here]
1024x768 on a 17" ??? - that can't be
12.1" - 1024 x 768
15.2" - 1280 x 854
15.2" - 1440 x 960
17" - 1440 x 900
17" - 1680 x 1050
if i remember right, your's should be the 1440x900