One fact that has been overlooked by (as far as I can tell) all of the people singing praises to Tiger, aka, Mac OS 10.4: it's the first major operating system upgrade distributed on a DVD. Yes, you can get it on CDs for older Macs, but you'll have to pay and you'll have to wait.
Apple's forward-thinking on distribution media starts 21 years ago when the first Mac came out with 3.5-inch floppies when essentially no other personal computer on the market had them. PC users laughed about that one until they realized that having greater capacity and many fewer media failures might be a good thing. Later, Apple was the first major vendor to distribute personal computers with no built-in floppy drive. Apple was also the first major vendor to include DVD readers as standard instead of as an option.
I have no predictions on where this is going...
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