I have learned over time that it does me absolutely no good to hold a grudge. i have a few people who have enraged me for one reason or another. The way I deal with those people is to just cut off all communication with them, and move on with my life. If they call, I ignore the phone, if they send me an e-mail, I do not respond, if I bump into them on the streets, I turn away. Just eliminating those people from my life has given me more peace.
Holding on to anger will only hurt you. Chances are, these people don't give it a second thought. They are moving on with their lives. Why should you let anyone have that kind of hold on you?