Hi PG, I don't know whether you're watching but this seems like a good example where it would be useful to grey out the URLs in downvoted posts as well as the message.
Whilst at the same time making URLs in downvoted posts plain text rather than a <a href=""> tag. Accidently clicking on a greyed out link because you couldn't see that there was a link there is just plain annoying.
They should also be nofollowed or the link will still help the spammer's pagerank. Any links in a comment having score < 0 should have the rel="nofollow" attribute set.
