Often, if i click on an url enclosed in parens (<a href="http://www.cnn.com)">http://www.cnn.com)</a> the url includes the trailing paren, and leads to a 404 error.
I submitted this to the feature request thread a couple weeks ago:
<a href="http://news.ycombinator.com/comments?id=10889">http://news.ycombinator.com/comments?id=10889</a>