Andrew C. Greenberg wrote:
> 
> >Personally I'd opt *for* the optional buttons but *against* the annotation
> >panes. [...]
> 
> I tend to agree with Andreas, less is more.  I'm not even all that 
> excited about the buttons.

I've been using them for testing layout features, and will turn them
off otherwise because I find they eat more screen than they're worth.
But I do think they're valuable for new users to get an idea of what
system navigation features are available from a browser.  Goodness
knows I was lost when I first started.

-Jesse