Threaded comments (highlighting new comments)

Hi all,

I just love the threaded comments, making it very easy to follow a conversation between commentators. That is, if you are new to the topic and the comments. If you’re following comments on an existing post on, say, a daily basis, it’s a hassle to locate the new comments.

Is there an easy way to highlight new comments?

I think it could be done with a cookie and looking at the comment publish date — resulting in a caching problem — but maybe there is an easy way?
Or do we need a nice plugin? ??

Thanks!