When I'm going back into a post to see what new responses have been added to a topic I'm interested in but don't want to subscribe to, it can get lengthy and I scroll down past the header. With the new graying out feature of threads you've read, you have to click onto the boards link at the top of the page or refresh the page once you've hit back to see the thread grayed out. That can be a lot of scrolling (maybe it is just me) on very lengthy threads. Perhaps a link a the bottom of a thread that is a scroll to top link?