Not really, no. Although it is worth reading Eric Meyer thoughts about it. Also, it looks like HTML5 1 includes the ability of any element to become a link, so it might be worth using this doctype instead of xhtml.
It is also worth adding that html 5 allows an element <a>to enclose block-level elements, see:http://www.brucelawson.co.uk/2008/any-element-linking-in-html-5/ , an example taken from the linked page:
Instead:
<h3><a href="story.htm">Bruce Lawson as Obama running mate!</a></h3>
<a href="story.htm"><img src="bruce.jpg" alt="lovegod" /> </a>
<p><a href="story.htm">In answer to McCain appointment of MILF, Sarah Palin, Obama hires DILF, Bruce Lawson, as his running mate. Read more!</a></p>
you can say:
<a href="story.htm">
<h3>Bruce Lawson as Obama running mate!</h3>
<img src="bruce.jpg" alt="lovegod" />
<p>In answer to McCain appointment of MILF, Sarah Palin, Obama hires DILF, Bruce Lawson, as his running mate. Read more!</p>
</a>
Updated to indicate possible inaccuracy
1: , , , , "... , HTML5... , " ( W3C html 5 ), , . , , .
, ... =/