Right now all there is, is either the topic title if you're viewing a topic or the board you are in (if you're viewing the board or making a new topic ex: Forum Suggestions).
It would be very nice to have something like "Forum Suggestions >> Board Chain Below Nav Bar" at the top with "Forum Suggestions" being a link. I think having the category there too is also an added bonus as "Mapping" and "Mods" both have a "Ideas/Discussion" board making it "Official >> Forum Suggestions >> Board Chain Below Nav Bar".
This would make the forum much easier to navigate especially if you were linked to a topic (For example you're new, you're linked to a mod and want to find more mods, you can easily just click "Mods" at the top). Most forums (if not all of them) I use do this (SMF) including the old forums (Ace of Spades Game Forums » Modding/Tools).