Why not add this feature next to the other options like "View Today's Post/View my Threads etc?

It will help people keep track of topics they have already posted on. It also allows them to watch topics easier. Maybe they are trying to find a contest they have posted on and needed to watch the time in which it started. Pressing this option, would quickly get them to the topics they want to go to with about two simple clicks.

Instead of just browsing the entire forum.

Look on the right side (top) of your screen.. You can watch there yur latest posts and threads.. Or do you mean on the game-site? Still i dont think this has to be added, if people just look a bit thye figure/find it out.

Suggested before, but I do think it is a good idea and should be implemented.

All those suggestions have already been implemented if u can see them when u open forums they are on the upper right hand side of the screen. And for the contests u can find them in the community options in left hand side options in the game.