Are there some forums that you have no desire to read or post in? Now you can hide these forums from your view by clicking on your name and through the drop-down menu hit 'Optional Forums' this will take you to the list of forums and you can untick those you wish to hide. Or simply go to your own personal details page and it's listed on the left side.
You should also be able to ignore individual threads if you still want to view any particular forum. Just click on Thread Tools above each thread.