The trunk version of the layout.html file has
response.title or request.application
in two parts of the page:
once for the <title> tag, and after in the body of the page (masthead's h4 element)
As
Paolo said, sometimes you want to differentiate the two elements.
Suppose someone wants an img to be shown in masthead, if you set
response.title to IMG(...), then the string output of the html element
will be shown as page title. AFAIK there's no way of solving this unless
you change the layout.html file (which is not that terrible, of
course).