534.
You mean if someone posted before you submitted your post, it brings you back to the 'post reply' page and say 'someone has posted before you. would you like to edit your post'? I saw that on another forum, but I think it was a different type of forum than this. I guess it would be nice, but I can also see why people would be against. While it does stop ninjaing, some people don't/wouldn't care and would just like to get their post through, and then edit afterwards.