in some cases typin the reply takes some time and after you send the reply you then discover that another member alredy made a very similar reply basicly making your reply unnessary , so it would be great if that when a member sends a reply the thread is checked for newer replies (newer after he clicked reply/accessed the thread that is) and if new replies found then it rejects the new reply and return the user to the reply page with a remark in some nice color like red that says "there have been new replies to this thread please read before posting a new reply"