I'm sorry but if you knew about Apple icons you'd know they care ALOT about the icon detail even if its not visible all the time. If your using OS X 10.5 Leopard or 10.6 Snow Leopard go into Applications and view the text edit icon on its max size, that has the writing taken off Apple's famous 1997 Think Different commercial. The Apple pages icon is also impressive in the dock, the glass inkwell jar is transparent around the rim just like a real glass jar. I also love the Leopard icon for a PC on the network

an UGLY CRT monitor with a BSOD on it LOL
I was waiting for someone to point this out. There are people attacking this other user's attempt at a replacement icon on grounds that it's too busy with details hidden when it's shrunk on the dock.
Safari is very detailed. Can you see the individual dashes on your dock? Or even the Americas in the background?
Mail has a Cupertino stamp which needs closer inspection.
The iWeb icon has a full demo iWeb page, complete with text.
The small calendar numbers on iCal's icon aren't visible from the dock.
Was the detail on the GarageBand icon a waste of time?
Not an Apple creation, but the Firefox globe doesn't stand out at a glance. That requires a closer inspection to notice.
The Dictionary icon's 'Dictionary/Thesarus' text isn't readable in the dock. Does that make it unnecessary?
The numbers in the Calculator icon's display can't be read on my dock... but again, it's Apple.
The Bento icon is an example of Apple-inspired icon design, and all its details certainly aren't visible on the dock.
Perhaps Apple's design principles are changing, but I see no reason for people to detract from the merits of a very strong substitute icon on grounds that it's too busy. The attention to detail fits with traditional Apple icon design, and the overarching theme plays nice with modern Apple design.
As for Apple's new icon... I'm indifferent. It's an icon and I'm free to change it, so I don't get what the hoo-hah is about. The old one was vulgar anyway.