If I attempt a comment block that includes other directives such as
[%#
<div id="menu">
Navigation:
<ul>
<li><a href="[% c.uri_for('/books/list') %]">Home</a></li>
<li><a href="[% c.uri_for('/') %]" title="Catalyst Welcome
Page">Welcome</a></li>
</ul>
</div><!-- end menu -->
%]
it didn't work as the first [%# matches the %] before ">Home.
Have discussed this briefly in #catalyst and we think it's a bug not a
feature. :)