Y'know what I'd love, Dan? An 'unfollow thread' option. Then I could 'opt out' of individual threads and not have them cluttering up my Unread and Recent screens.
This is in place now. In each topic you'll see a new action at the top of the screen - 'Ignore topic'.
This means it won't show in your unread lists, but it will still be shown when browsing the forum board-by-board.