Whether you are the offended, the offender, or the person stuck in the middle, there is practical help in the Bible for how to deal with conflict. You can listen, watch, or read the transcript of Pastor Mark Driscoll's 8th sermon in the Jesus Loves the Church series.
"If your brother sins against you, go and tell him his fault, between you and him alone. If he listens to you, you have gained your brother. Matthew 18:15 ESV