It seems that for the thoughtful Christian there is very little helpful information to be found on birth control. There is a lot of information to be found, just not very helpful. Over the years what I've found is a lot has been written about using no birth control as the only truly Biblical option, with perhaps some consideration for Natural Family Planning. Otherwise there is silence.
Mark Driscoll does an excellent job of answering the question in a very realistic and balanced way. He goes through "Five Levels" of birth control and discusses whether each level is an appropriate option for Christian couples, while maintaining that children are absolutely, without a doubt, blessings from the Lord.