Originally Posted by proud2Bwhack
look for people limping or checking the flop.
With this you have to be careful. They might be real calling stations, so observe them well and see how they react to your raises.
Early in the tournament it's indeed silly to bluff, but later it can work out if you look for the right opportunity. Just make sure you have the right kind of player against you to do this, because even later in the tournament there are people that got there by luck.