Can't find anything addressing this specifically
If you're viewing a single post and the Next Post and Previous Post titles are really long?
The next_post_link and previous_post_link, if floated left and right on the same line are going to start fighting for space in the middle.
I assume someone's figured out a way to set a character limit on this function? The closest I think I've gotten was putting this in the functions.php, but it still doesn't work:
<?php add_filter('next_post_link', create_function('$shortnext','return substr($shortnext,0,25);'))>