If you've visited the main page of the official forums lately, you'll notice that things are a little different -- they've replaced the simple links to class, realm, and battlegroup forums with a dynamic interface. All the forums that were there are still there, but the navigation to them is a little faster and less cluttered. It's not Flash or anything fancy, so it should work just fine across any number of widely used browsers.
Something like this was probably inevitable, considering how much Blizzard's WoW forums have been multiplying -- there's one for every release, event, and topic Blizzard can think of. And considering they have only so many people running them, it means the threads further off the beaten path, especially realm threads, can run rampant with forum violations.
Not that that's a problem -- what's in those threads can be pretty entertaining. But Blizzard moderates the forums for a reason, and the more threads they have, the harder time they'll have moderating them.