> > Could we use a link in the head that goes to a static (cacheable) file
> > for site-wide navigation? I know you could use a server side include,
> > but it seems kludgy, as you are still sending (potentially) quite a lot
> > of HTML with every page.

I believe this is what the purpose of several of the original link
types was, and to me it would be much cleaner than duplicating
menus on every page.

> 
> There are at least 2 major problems with using technique like that.
> 1. Backwards compatibility.
> 2. Such a major conceptual change in the way pages are linked is 
> unlikely to catch on significantly in the real world.

3.  I would result in uniform behaviour (for a single browser) across 
    sites, which would be rejected by designers because it frustrated
    branding.