The best way to do it is the way i do it.

When u log on, click new posts, and view the ones you wish to look at.

When done, simply scroll to the bottom of the forum above the chat box, just under the site suggestions/comment bit, and cick Mark Forums Read.

That means that when u next click new posts at the top of the forums, all the ones youve read or chose not to ead will not be there, unless they have had new posts in them since