Bruce,
I think you've got your head screwed on right.
Basically, what we need is what's called a "style guide" that outlines global interface elements, how they're used, and an initial design for them.
Then that needs to be translated into our default HTML and CSS.
The goal should be that the interactional elements are so solid that you generally don't want to change the HTML, but can change your fonts, colors, and detailed design through CSS alone. At least for most sites.
And yes, this is a global effort, which is going to require coordination, but more than that, I think it requires someone who knows what they're doing: An information architect and a designer, both experienced.
/Lars
