There is a lot of things written on Anger and its management. I have heard lot of times, its not good to be angry, i feel differently. I feel anger is a basic emotion like happiness and crying, and thus should not be suppressed. It's good to be feeling and being angry, else we would just become vegetables.
What is bad is how anger is handled. It is very important to hold your tongue and body when angry. It's important to not do anything irrational when angry. When angry, try to think more rationally about it..Like how a third person would think on the situation and on the anger. Channelizing your anger is very important. Sometimes physical exercise, long walk and chatting with a good friend helps you develop a deeper insight.