I would like to have a "mark forums read" link at the bottom of the "what's new" page. When you're scrolling through the posts you presumably end up at the bottom of the page. To then have to scroll up to the top of the page to click the "mark read" link seems like an extra step that doesn't need to be there. The logical place to have it would be at the bottom when you finish the list.
I'm not saying it shouldn't be at the top, it should, I just think it should be at the bottom too.