split out helpers._render_type, and add support for ?type= to various other handlers... still needs more work, though
<%inherit file="layout.tmpl" />
<div id="title">Available Channels</div>
<ul>
% for channel in channel_list :
<li><a href="${urls.channel.build(req, channel=channel)}">${channel.title}</a></li>
% endfor
</ul>