The MS comeback ad to that - the one about how easy it is to upgrade a mac - is a classic, shame they lost their bottle 
64bit has hidden dangers - piss poor drivers. Just be aware of that before jumping in with both feet. The situation is improving rapidly (to get Vista Certification, you have to ensure your hardware/software is 64bit compatible).
Apple users and developers are used to having to abandon old code - its happened 3 times - port from Motorola to PPC, jump to OS X, and now the switch to Intel.
MS has always bent over (too?) backwards to ensure backwards compatibility. Now that they are enforcing a tidy up to sloppy programming, everyone is up in arms. I can't understand it.
I agree about the ad, really the simple appraoch is best, and they could have used it to expound the virtues of the OS as well.
I've heard this about the 64bit version, but all my device drivers are vista certified anyway - spaceball and wacom tablet.
I know all to well about the OS jump, but the transition from OS9 - X was made really easy by running the old OS in an invisible shell, so that the apps ran nativly within X.
I agree about what the problem was regarding driver issues, as you said, the option had been there for years, and tbh, 16bit compatibility ?!?
I don't play games on it, so the only software I run is from Adobe, MS, and High end design companies like Dassault and Autodesk.
They all have 64bit native versions now, so I figure it was time to make the leap.
I'll be running it with 8gb, and my Quadro card now has native vista 64 drivers also.
Thats apoint... will epc 3 work in vista ...
