q, quote, blockquote

This may be a little late in bringing this up, but I was just looking  
through the wiki (MuchAdoAboutQ) -

Why do we have need any of these elements? A quote is not a  
structural building block in the same sense as a paragraph. That is  
to say that a quoted paragraph is still just a paragraph -- it just  
happens to originate with another author.

Wouldn't something like:

<p>Einstein said <span class="quote" src="http://www.example.com/"  
cite="Human-comprehensible bibliographic information" >I don't know  
what will be used in the next world war, but the 4th will be fought  
with stones</span>.</p>

or

<p class="quote" src="http://www.example.com/" cite="Human- 
comprehensible bibliographic information" >Most people go on living  
their everyday life: half frightened, half indifferent, they behold  
the ghostly tragi-comedy that is being performed on the international  
stage before the eyes and ears of the world.</p>

or

<div class="blockquote" src="http://www.example.com/" cite="Human- 
comprehensible bibliographic information" >
<p>The process of scientific discovery is, in effect, a continual  
flight from wonder.</p>
<p>The mere formulation of a problem is far more essential than its  
solution, which may be merely a matter of mathematical or  
experimental skills. To raise new questions, new possibilities, to  
regard old problems from a new angle requires creative imagination  
and marks real advances in science.</p>
</div>

make more sense semantically?

As for formatting quotes, all three would rely on CSS.

Charles