From what i hear 10.3 should improve the performace of the G5 Macs. How much of a factor will this play? Will it be remarkable? I have also heard that it will also improve performance on older Macs including G3 Macs. Is there any truth to this? I would like to order a copy now, but I would like to know how it will run on my 500Mhz iBook, and I would also like to know how much of a role this will play in the G5's as I would like to get a 1.6Ghz model. The price is right, and I love the machine, but it would be nice to see how it will run when optimized. I don't want to kick myself later whishing that I saved a little more for the 1.8. Sorry if this has been posted before, if it has just refer me to the old thread. Thanks for any info.