Other forums that I visit for help have this feature, and it seems like it would be very helpful.
Often times, someone will post a thread and because of the number of people online it may start to sink to the bottom without receiving any replies. What I suggest is having a slight background shade to all threads that have 0 replies. This way, when helpers come on the forum to see what questions people have, they can very quickly find the posts that have received 0 replies, and maybe help them out.
Just a thought. :)