yeh thats pretty wierd, theres only one topic left which has posts from yesterday in it and thats the half life and portal thread in the pc and retro section but even then some posts have dissapeard, also the entire contents of the buying section have gone aswell.
It could be something to do with the forumotion server, shall go see what state other forums are in
EDIT: I think it is a server prolem as all other forumotion sites i've just checked have no posts dating from yesterday either