When you first open up the board you get three board titles, All Topics, Calendar and Board Help.
Immediately to the left are Avatars that are Dark Blue or very Light Blue. It the avatar is dark blue it indicates that new post(s) have been made since you last visited the board. If it is light blue than there is no need to open up that board as there are no new posts to read.
I know, I know it is so simple but I just checked and I have been on this board a total of 178 hours and just noticed this today!
Richard
Wow. Just hit 400 posts. Maybe I need to get a life!