In the similar <li>
which begins 'Love This', IE is breaking at the ? character in the url. There is no ? in the problem url. I added one (like this: http://farm3.static.flickr.com/2339?2152480352_1b5ee54c44.jpg
) just to see what would happen, and the url wrapped nicely. Of course, then the url is not valid...
This isn't a fix, but maybe it will give you or someone else a clue.
A workaround would be to use simpler text for the display with the full url only in the href:
<a href='http://long_complicated_url'>Click here for video</a>