green bunnies and red bunnies

How come some bnunnis to the left of the forum section descriptions are red and some are green?

Think it means there are unread posts in the forum if they are red.. and green means all read...

As above. The view posts since last visit key under the left of the navigation bar functions as a list of new posts which should make finding your way about a little easier to do.

if you look down the very bottom of the forum it gives you a key of what the different icons mean too