Better comment titles

My comment list is a never-ending parade of 'flickr comment' titles. I think this would look better if we were to instead cut the first, say, 30 characters of the comment and use this as the title field. I did this by replacing line 94 with
'subject' => t(substr(html_entity_decode(html_entity_decode($c['_content'])),0,30)), (patch attached).

There are probably better ways to do this, but maybe this can get the ball rolling.

If there is any interest in this, maybe we can add an admin setting to determine the size of the truncation or even some other format.